| 1 | /* thread.h |
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| 2 | * |
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| 3 | * Copyright (c) 1997-2002, Larry Wall |
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| 4 | * |
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| 5 | * You may distribute under the terms of either the GNU General Public |
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| 6 | * License or the Artistic License, as specified in the README file. |
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| 7 | * |
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| 8 | */ |
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| 9 | |
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| 10 | #if defined(USE_5005THREADS) || defined(USE_ITHREADS) |
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| 11 | |
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| 12 | #if defined(VMS) |
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| 13 | #include <builtins.h> |
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| 14 | #endif |
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| 15 | |
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| 16 | #ifdef WIN32 |
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| 17 | # include <win32thread.h> |
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| 18 | #else |
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| 19 | #ifdef NETWARE |
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| 20 | # include <nw5thread.h> |
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| 21 | #else |
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| 22 | # ifdef OLD_PTHREADS_API /* Here be dragons. */ |
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| 23 | # define DETACH(t) \ |
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| 24 | STMT_START { \ |
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| 25 | if (pthread_detach(&(t)->self)) { \ |
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| 26 | MUTEX_UNLOCK(&(t)->mutex); \ |
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| 27 | Perl_croak_nocontext("panic: DETACH"); \ |
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| 28 | } \ |
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| 29 | } STMT_END |
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| 30 | |
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| 31 | # define PERL_GET_CONTEXT Perl_get_context() |
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| 32 | # define PERL_SET_CONTEXT(t) Perl_set_context((void*)t) |
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| 33 | |
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| 34 | # define PTHREAD_GETSPECIFIC_INT |
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| 35 | # ifdef DJGPP |
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| 36 | # define pthread_addr_t any_t |
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| 37 | # define NEED_PTHREAD_INIT |
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| 38 | # define PTHREAD_CREATE_JOINABLE (1) |
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| 39 | # endif |
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| 40 | # ifdef __OPEN_VM |
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| 41 | # define pthread_addr_t void * |
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| 42 | # endif |
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| 43 | # ifdef VMS |
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| 44 | # define pthread_attr_init(a) pthread_attr_create(a) |
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| 45 | # define PTHREAD_ATTR_SETDETACHSTATE(a,s) pthread_setdetach_np(a,s) |
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| 46 | # define PTHREAD_CREATE(t,a,s,d) pthread_create(t,a,s,d) |
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| 47 | # define pthread_key_create(k,d) pthread_keycreate(k,(pthread_destructor_t)(d)) |
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| 48 | # define pthread_mutexattr_init(a) pthread_mutexattr_create(a) |
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| 49 | # define pthread_mutexattr_settype(a,t) pthread_mutexattr_setkind_np(a,t) |
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| 50 | # endif |
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| 51 | # if defined(__hpux) && defined(__ux_version) && __ux_version <= 1020 |
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| 52 | # define pthread_attr_init(a) pthread_attr_create(a) |
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| 53 | /* XXX pthread_setdetach_np() missing in DCE threads on HP-UX 10.20 */ |
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| 54 | # define PTHREAD_ATTR_SETDETACHSTATE(a,s) (0) |
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| 55 | # define PTHREAD_CREATE(t,a,s,d) pthread_create(t,a,s,d) |
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| 56 | # define pthread_key_create(k,d) pthread_keycreate(k,(pthread_destructor_t)(d)) |
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| 57 | # define pthread_mutexattr_init(a) pthread_mutexattr_create(a) |
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| 58 | # define pthread_mutexattr_settype(a,t) pthread_mutexattr_setkind_np(a,t) |
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| 59 | # endif |
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| 60 | # if defined(DJGPP) || defined(__OPEN_VM) |
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| 61 | # define PTHREAD_ATTR_SETDETACHSTATE(a,s) pthread_attr_setdetachstate(a,&(s)) |
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| 62 | # define YIELD pthread_yield(NULL) |
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| 63 | # endif |
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| 64 | # endif |
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| 65 | # if !defined(__hpux) || !defined(__ux_version) || __ux_version > 1020 |
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| 66 | # define pthread_mutexattr_default NULL |
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| 67 | # define pthread_condattr_default NULL |
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| 68 | # endif |
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| 69 | #endif /* NETWARE */ |
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| 70 | #endif |
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| 71 | |
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| 72 | #ifndef PTHREAD_CREATE |
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| 73 | /* You are not supposed to pass NULL as the 2nd arg of PTHREAD_CREATE(). */ |
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| 74 | # define PTHREAD_CREATE(t,a,s,d) pthread_create(t,&(a),s,d) |
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| 75 | #endif |
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| 76 | |
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| 77 | #ifndef PTHREAD_ATTR_SETDETACHSTATE |
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| 78 | # define PTHREAD_ATTR_SETDETACHSTATE(a,s) pthread_attr_setdetachstate(a,s) |
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| 79 | #endif |
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| 80 | |
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| 81 | #ifndef PTHREAD_CREATE_JOINABLE |
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| 82 | # ifdef OLD_PTHREAD_CREATE_JOINABLE |
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| 83 | # define PTHREAD_CREATE_JOINABLE OLD_PTHREAD_CREATE_JOINABLE |
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| 84 | # else |
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| 85 | # define PTHREAD_CREATE_JOINABLE 0 /* Panic? No, guess. */ |
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| 86 | # endif |
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| 87 | #endif |
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| 88 | |
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| 89 | #ifdef DGUX |
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| 90 | # define THREAD_CREATE_NEEDS_STACK (32*1024) |
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| 91 | #endif |
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| 92 | |
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| 93 | #ifdef I_MACH_CTHREADS |
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| 94 | |
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| 95 | /* cthreads interface */ |
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| 96 | |
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| 97 | /* #include <mach/cthreads.h> is in perl.h #ifdef I_MACH_CTHREADS */ |
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| 98 | |
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| 99 | #define MUTEX_INIT(m) \ |
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| 100 | STMT_START { \ |
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| 101 | *m = mutex_alloc(); \ |
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| 102 | if (*m) { \ |
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| 103 | mutex_init(*m); \ |
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| 104 | } else { \ |
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| 105 | Perl_croak_nocontext("panic: MUTEX_INIT"); \ |
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| 106 | } \ |
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| 107 | } STMT_END |
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| 108 | |
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| 109 | #define MUTEX_LOCK(m) mutex_lock(*m) |
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| 110 | #define MUTEX_UNLOCK(m) mutex_unlock(*m) |
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| 111 | #define MUTEX_DESTROY(m) \ |
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| 112 | STMT_START { \ |
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| 113 | mutex_free(*m); \ |
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| 114 | *m = 0; \ |
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| 115 | } STMT_END |
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| 116 | |
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| 117 | #define COND_INIT(c) \ |
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| 118 | STMT_START { \ |
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| 119 | *c = condition_alloc(); \ |
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| 120 | if (*c) { \ |
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| 121 | condition_init(*c); \ |
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| 122 | } \ |
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| 123 | else { \ |
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| 124 | Perl_croak_nocontext("panic: COND_INIT"); \ |
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| 125 | } \ |
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| 126 | } STMT_END |
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| 127 | |
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| 128 | #define COND_SIGNAL(c) condition_signal(*c) |
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| 129 | #define COND_BROADCAST(c) condition_broadcast(*c) |
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| 130 | #define COND_WAIT(c, m) condition_wait(*c, *m) |
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| 131 | #define COND_DESTROY(c) \ |
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| 132 | STMT_START { \ |
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| 133 | condition_free(*c); \ |
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| 134 | *c = 0; \ |
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| 135 | } STMT_END |
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| 136 | |
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| 137 | #define THREAD_CREATE(thr, f) (thr->self = cthread_fork(f, thr), 0) |
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| 138 | #define THREAD_POST_CREATE(thr) |
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| 139 | |
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| 140 | #define THREAD_RET_TYPE any_t |
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| 141 | #define THREAD_RET_CAST(x) ((any_t) x) |
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| 142 | |
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| 143 | #define DETACH(t) cthread_detach(t->self) |
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| 144 | #define JOIN(t, avp) (*(avp) = (AV *)cthread_join(t->self)) |
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| 145 | |
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| 146 | #define PERL_SET_CONTEXT(t) cthread_set_data(cthread_self(), t) |
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| 147 | #define PERL_GET_CONTEXT cthread_data(cthread_self()) |
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| 148 | |
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| 149 | #define INIT_THREADS cthread_init() |
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| 150 | #define YIELD cthread_yield() |
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| 151 | #define ALLOC_THREAD_KEY NOOP |
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| 152 | #define FREE_THREAD_KEY NOOP |
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| 153 | #define SET_THREAD_SELF(thr) (thr->self = cthread_self()) |
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| 154 | |
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| 155 | #endif /* I_MACH_CTHREADS */ |
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| 156 | |
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| 157 | #ifndef YIELD |
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| 158 | # ifdef SCHED_YIELD |
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| 159 | # define YIELD SCHED_YIELD |
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| 160 | # else |
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| 161 | # ifdef HAS_SCHED_YIELD |
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| 162 | # define YIELD sched_yield() |
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| 163 | # else |
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| 164 | # ifdef HAS_PTHREAD_YIELD |
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| 165 | /* pthread_yield(NULL) platforms are expected |
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| 166 | * to have #defined YIELD for themselves. */ |
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| 167 | # define YIELD pthread_yield() |
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| 168 | # endif |
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| 169 | # endif |
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| 170 | # endif |
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| 171 | #endif |
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| 172 | |
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| 173 | #ifdef __hpux |
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| 174 | # define MUTEX_INIT_NEEDS_MUTEX_ZEROED |
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| 175 | #endif |
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| 176 | |
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| 177 | #ifndef MUTEX_INIT |
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| 178 | |
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| 179 | # ifdef MUTEX_INIT_NEEDS_MUTEX_ZEROED |
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| 180 | /* Temporary workaround, true bug is deeper. --jhi 1999-02-25 */ |
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| 181 | # define MUTEX_INIT(m) \ |
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| 182 | STMT_START { \ |
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| 183 | Zero((m), 1, perl_mutex); \ |
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| 184 | if (pthread_mutex_init((m), pthread_mutexattr_default)) \ |
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| 185 | Perl_croak_nocontext("panic: MUTEX_INIT"); \ |
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| 186 | } STMT_END |
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| 187 | # else |
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| 188 | # define MUTEX_INIT(m) \ |
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| 189 | STMT_START { \ |
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| 190 | if (pthread_mutex_init((m), pthread_mutexattr_default)) \ |
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| 191 | Perl_croak_nocontext("panic: MUTEX_INIT"); \ |
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| 192 | } STMT_END |
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| 193 | # endif |
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| 194 | |
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| 195 | # define MUTEX_LOCK(m) \ |
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| 196 | STMT_START { \ |
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| 197 | if (pthread_mutex_lock((m))) \ |
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| 198 | Perl_croak_nocontext("panic: MUTEX_LOCK"); \ |
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| 199 | } STMT_END |
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| 200 | |
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| 201 | # define MUTEX_UNLOCK(m) \ |
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| 202 | STMT_START { \ |
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| 203 | if (pthread_mutex_unlock((m))) \ |
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| 204 | Perl_croak_nocontext("panic: MUTEX_UNLOCK"); \ |
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| 205 | } STMT_END |
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| 206 | |
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| 207 | # define MUTEX_DESTROY(m) \ |
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| 208 | STMT_START { \ |
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| 209 | if (pthread_mutex_destroy((m))) \ |
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| 210 | Perl_croak_nocontext("panic: MUTEX_DESTROY"); \ |
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| 211 | } STMT_END |
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| 212 | #endif /* MUTEX_INIT */ |
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| 213 | |
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| 214 | #ifndef COND_INIT |
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| 215 | # define COND_INIT(c) \ |
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| 216 | STMT_START { \ |
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| 217 | if (pthread_cond_init((c), pthread_condattr_default)) \ |
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| 218 | Perl_croak_nocontext("panic: COND_INIT"); \ |
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| 219 | } STMT_END |
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| 220 | |
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| 221 | # define COND_SIGNAL(c) \ |
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| 222 | STMT_START { \ |
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| 223 | if (pthread_cond_signal((c))) \ |
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| 224 | Perl_croak_nocontext("panic: COND_SIGNAL"); \ |
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| 225 | } STMT_END |
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| 226 | |
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| 227 | # define COND_BROADCAST(c) \ |
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| 228 | STMT_START { \ |
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| 229 | if (pthread_cond_broadcast((c))) \ |
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| 230 | Perl_croak_nocontext("panic: COND_BROADCAST"); \ |
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| 231 | } STMT_END |
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| 232 | |
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| 233 | # define COND_WAIT(c, m) \ |
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| 234 | STMT_START { \ |
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| 235 | if (pthread_cond_wait((c), (m))) \ |
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| 236 | Perl_croak_nocontext("panic: COND_WAIT"); \ |
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| 237 | } STMT_END |
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| 238 | |
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| 239 | # define COND_DESTROY(c) \ |
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| 240 | STMT_START { \ |
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| 241 | if (pthread_cond_destroy((c))) \ |
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| 242 | Perl_croak_nocontext("panic: COND_DESTROY"); \ |
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| 243 | } STMT_END |
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| 244 | #endif /* COND_INIT */ |
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| 245 | |
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| 246 | /* DETACH(t) must only be called while holding t->mutex */ |
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| 247 | #ifndef DETACH |
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| 248 | # define DETACH(t) \ |
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| 249 | STMT_START { \ |
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| 250 | if (pthread_detach((t)->self)) { \ |
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| 251 | MUTEX_UNLOCK(&(t)->mutex); \ |
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| 252 | Perl_croak_nocontext("panic: DETACH"); \ |
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| 253 | } \ |
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| 254 | } STMT_END |
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| 255 | #endif /* DETACH */ |
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| 256 | |
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| 257 | #ifndef JOIN |
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| 258 | # define JOIN(t, avp) \ |
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| 259 | STMT_START { \ |
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| 260 | if (pthread_join((t)->self, (void**)(avp))) \ |
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| 261 | Perl_croak_nocontext("panic: pthread_join"); \ |
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| 262 | } STMT_END |
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| 263 | #endif /* JOIN */ |
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| 264 | |
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| 265 | /* Use an unchecked fetch of thread-specific data instead of a checked one. |
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| 266 | * It would fail if the key were bogus, but if the key were bogus then |
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| 267 | * Really Bad Things would be happening anyway. --dan */ |
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| 268 | #if (defined(__ALPHA) && (__VMS_VER >= 70000000)) || \ |
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| 269 | (defined(__alpha) && defined(__osf__)) /* Available only on >= 4.0 */ |
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| 270 | # define HAS_PTHREAD_UNCHECKED_GETSPECIFIC_NP /* Configure test needed */ |
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| 271 | #endif |
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| 272 | |
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| 273 | #ifdef HAS_PTHREAD_UNCHECKED_GETSPECIFIC_NP |
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| 274 | # define PTHREAD_GETSPECIFIC(key) pthread_unchecked_getspecific_np(key) |
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| 275 | #else |
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| 276 | # define PTHREAD_GETSPECIFIC(key) pthread_getspecific(key) |
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| 277 | #endif |
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| 278 | |
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| 279 | #ifndef PERL_GET_CONTEXT |
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| 280 | # define PERL_GET_CONTEXT PTHREAD_GETSPECIFIC(PL_thr_key) |
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| 281 | #endif |
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| 282 | |
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| 283 | #ifndef PERL_SET_CONTEXT |
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| 284 | # define PERL_SET_CONTEXT(t) \ |
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| 285 | STMT_START { \ |
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| 286 | if (pthread_setspecific(PL_thr_key, (void *)(t))) \ |
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| 287 | Perl_croak_nocontext("panic: pthread_setspecific"); \ |
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| 288 | } STMT_END |
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| 289 | #endif /* PERL_SET_CONTEXT */ |
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| 290 | |
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| 291 | #ifndef INIT_THREADS |
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| 292 | # ifdef NEED_PTHREAD_INIT |
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| 293 | # define INIT_THREADS pthread_init() |
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| 294 | # endif |
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| 295 | #endif |
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| 296 | |
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| 297 | #ifndef ALLOC_THREAD_KEY |
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| 298 | # define ALLOC_THREAD_KEY \ |
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| 299 | STMT_START { \ |
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| 300 | if (pthread_key_create(&PL_thr_key, 0)) { \ |
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| 301 | PerlIO_printf(PerlIO_stderr(), "panic: pthread_key_create"); \ |
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| 302 | exit(1); \ |
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| 303 | } \ |
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| 304 | } STMT_END |
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| 305 | #endif |
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| 306 | |
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| 307 | #ifndef FREE_THREAD_KEY |
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| 308 | # define FREE_THREAD_KEY \ |
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| 309 | STMT_START { \ |
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| 310 | pthread_key_delete(PL_thr_key); \ |
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| 311 | } STMT_END |
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| 312 | #endif |
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| 313 | |
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| 314 | #ifndef PTHREAD_ATFORK |
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| 315 | # ifdef HAS_PTHREAD_ATFORK |
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| 316 | # define PTHREAD_ATFORK(prepare,parent,child) \ |
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| 317 | pthread_atfork(prepare,parent,child) |
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| 318 | # else |
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| 319 | # define PTHREAD_ATFORK(prepare,parent,child) \ |
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| 320 | NOOP |
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| 321 | # endif |
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| 322 | #endif |
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| 323 | |
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| 324 | #ifndef THREAD_RET_TYPE |
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| 325 | # define THREAD_RET_TYPE void * |
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| 326 | # define THREAD_RET_CAST(p) ((void *)(p)) |
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| 327 | #endif /* THREAD_RET */ |
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| 328 | |
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| 329 | #if defined(USE_5005THREADS) |
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| 330 | |
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| 331 | /* Accessor for per-thread SVs */ |
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| 332 | # define THREADSV(i) (thr->threadsvp[i]) |
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| 333 | |
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| 334 | /* |
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| 335 | * LOCK_SV_MUTEX and UNLOCK_SV_MUTEX are performance-critical. Here, we |
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| 336 | * try only locking them if there may be more than one thread in existence. |
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| 337 | * Systems with very fast mutexes (and/or slow conditionals) may wish to |
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| 338 | * remove the "if (threadnum) ..." test. |
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| 339 | * XXX do NOT use C<if (PL_threadnum) ...> -- it sets up race conditions! |
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| 340 | */ |
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| 341 | # define LOCK_SV_MUTEX MUTEX_LOCK(&PL_sv_mutex) |
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| 342 | # define UNLOCK_SV_MUTEX MUTEX_UNLOCK(&PL_sv_mutex) |
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| 343 | # define LOCK_STRTAB_MUTEX MUTEX_LOCK(&PL_strtab_mutex) |
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| 344 | # define UNLOCK_STRTAB_MUTEX MUTEX_UNLOCK(&PL_strtab_mutex) |
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| 345 | # define LOCK_CRED_MUTEX MUTEX_LOCK(&PL_cred_mutex) |
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| 346 | # define UNLOCK_CRED_MUTEX MUTEX_UNLOCK(&PL_cred_mutex) |
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| 347 | # define LOCK_FDPID_MUTEX MUTEX_LOCK(&PL_fdpid_mutex) |
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| 348 | # define UNLOCK_FDPID_MUTEX MUTEX_UNLOCK(&PL_fdpid_mutex) |
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| 349 | # define LOCK_SV_LOCK_MUTEX MUTEX_LOCK(&PL_sv_lock_mutex) |
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| 350 | # define UNLOCK_SV_LOCK_MUTEX MUTEX_UNLOCK(&PL_sv_lock_mutex) |
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| 351 | |
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| 352 | /* Values and macros for thr->flags */ |
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| 353 | #define THRf_STATE_MASK 7 |
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| 354 | #define THRf_R_JOINABLE 0 |
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| 355 | #define THRf_R_JOINED 1 |
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| 356 | #define THRf_R_DETACHED 2 |
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| 357 | #define THRf_ZOMBIE 3 |
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| 358 | #define THRf_DEAD 4 |
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| 359 | |
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| 360 | #define THRf_DID_DIE 8 |
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| 361 | |
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| 362 | /* ThrSTATE(t) and ThrSETSTATE(t) must only be called while holding t->mutex */ |
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| 363 | #define ThrSTATE(t) ((t)->flags & THRf_STATE_MASK) |
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| 364 | #define ThrSETSTATE(t, s) STMT_START { \ |
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| 365 | (t)->flags &= ~THRf_STATE_MASK; \ |
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| 366 | (t)->flags |= (s); \ |
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| 367 | DEBUG_S(PerlIO_printf(Perl_debug_log, \ |
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| 368 | "thread %p set to state %d\n", (t), (s))); \ |
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| 369 | } STMT_END |
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| 370 | |
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| 371 | typedef struct condpair { |
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| 372 | perl_mutex mutex; /* Protects all other fields */ |
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| 373 | perl_cond owner_cond; /* For when owner changes at all */ |
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| 374 | perl_cond cond; /* For cond_signal and cond_broadcast */ |
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| 375 | Thread owner; /* Currently owning thread */ |
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| 376 | } condpair_t; |
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| 377 | |
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| 378 | #define MgMUTEXP(mg) (&((condpair_t *)(mg->mg_ptr))->mutex) |
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| 379 | #define MgOWNERCONDP(mg) (&((condpair_t *)(mg->mg_ptr))->owner_cond) |
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| 380 | #define MgCONDP(mg) (&((condpair_t *)(mg->mg_ptr))->cond) |
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| 381 | #define MgOWNER(mg) ((condpair_t *)(mg->mg_ptr))->owner |
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| 382 | |
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| 383 | #endif /* USE_5005THREADS */ |
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| 384 | #endif /* USE_5005THREADS || USE_ITHREADS */ |
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| 385 | |
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| 386 | #ifndef MUTEX_LOCK |
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| 387 | # define MUTEX_LOCK(m) |
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| 388 | #endif |
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| 389 | |
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| 390 | #ifndef MUTEX_UNLOCK |
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| 391 | # define MUTEX_UNLOCK(m) |
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| 392 | #endif |
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| 393 | |
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| 394 | #ifndef MUTEX_INIT |
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| 395 | # define MUTEX_INIT(m) |
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| 396 | #endif |
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| 397 | |
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| 398 | #ifndef MUTEX_DESTROY |
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| 399 | # define MUTEX_DESTROY(m) |
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| 400 | #endif |
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| 401 | |
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| 402 | #ifndef COND_INIT |
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| 403 | # define COND_INIT(c) |
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| 404 | #endif |
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| 405 | |
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| 406 | #ifndef COND_SIGNAL |
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| 407 | # define COND_SIGNAL(c) |
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| 408 | #endif |
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| 409 | |
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| 410 | #ifndef COND_BROADCAST |
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| 411 | # define COND_BROADCAST(c) |
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| 412 | #endif |
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| 413 | |
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| 414 | #ifndef COND_WAIT |
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| 415 | # define COND_WAIT(c, m) |
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| 416 | #endif |
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| 417 | |
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| 418 | #ifndef COND_DESTROY |
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| 419 | # define COND_DESTROY(c) |
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| 420 | #endif |
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| 421 | |
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| 422 | #ifndef LOCK_SV_MUTEX |
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| 423 | # define LOCK_SV_MUTEX |
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| 424 | #endif |
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| 425 | |
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| 426 | #ifndef UNLOCK_SV_MUTEX |
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| 427 | # define UNLOCK_SV_MUTEX |
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| 428 | #endif |
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| 429 | |
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| 430 | #ifndef LOCK_STRTAB_MUTEX |
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| 431 | # define LOCK_STRTAB_MUTEX |
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| 432 | #endif |
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| 433 | |
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| 434 | #ifndef UNLOCK_STRTAB_MUTEX |
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| 435 | # define UNLOCK_STRTAB_MUTEX |
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| 436 | #endif |
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| 437 | |
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| 438 | #ifndef LOCK_CRED_MUTEX |
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| 439 | # define LOCK_CRED_MUTEX |
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| 440 | #endif |
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| 441 | |
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| 442 | #ifndef UNLOCK_CRED_MUTEX |
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| 443 | # define UNLOCK_CRED_MUTEX |
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| 444 | #endif |
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| 445 | |
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| 446 | #ifndef LOCK_FDPID_MUTEX |
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| 447 | # define LOCK_FDPID_MUTEX |
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| 448 | #endif |
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| 449 | |
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| 450 | #ifndef UNLOCK_FDPID_MUTEX |
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| 451 | # define UNLOCK_FDPID_MUTEX |
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| 452 | #endif |
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| 453 | |
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| 454 | #ifndef LOCK_SV_LOCK_MUTEX |
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| 455 | # define LOCK_SV_LOCK_MUTEX |
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| 456 | #endif |
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| 457 | |
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| 458 | #ifndef UNLOCK_SV_LOCK_MUTEX |
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| 459 | # define UNLOCK_SV_LOCK_MUTEX |
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| 460 | #endif |
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| 461 | |
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| 462 | /* THR, SET_THR, and dTHR are there for compatibility with old versions */ |
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| 463 | #ifndef THR |
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| 464 | # define THR PERL_GET_THX |
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| 465 | #endif |
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| 466 | |
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| 467 | #ifndef SET_THR |
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| 468 | # define SET_THR(t) PERL_SET_THX(t) |
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| 469 | #endif |
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| 470 | |
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| 471 | #ifndef dTHR |
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| 472 | # define dTHR dNOOP |
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| 473 | #endif |
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| 474 | |
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| 475 | #ifndef INIT_THREADS |
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| 476 | # define INIT_THREADS NOOP |
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| 477 | #endif |
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