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2004-09-07 Jakub Jelinek <jakub@redhat.com> * sysdeps/powerpc/powerpc64/configure.in: New file. * config.h.in (USE_PPC64_OVERLAPPING_OPD): Add. * configure.in (HAVE_ASM_GLOBAL_DOT_NAME): Remove. * sysdeps/powerpc/powerpc64/sysdep.h: Formatting. (OPD_ENT, BODY_LABEL, ENTRY_1, ENTRY_2, END_2, DOT_PREFIX, BODY_PREFIX): Define. (ENTRY, DOT_LABEL, END, TRACEBACK, END_GEN_TB, EALIGN): Support HAVE_ASM_GLOBAL_DOT_NAME or no dot symbols, USE_PPC64_OVERLAPPING_OPD or never overlapping .opd entries. * sysdeps/powerpc/powerpc64/dl-machine.h: Include sysdep.h. (TRAMPOLINE_TEMPLATE, RTLD_START): Use the new sysdep.h macros.
45 lines
938 B
Plaintext
45 lines
938 B
Plaintext
Barriers pseudocode
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===================
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int pthread_barrier_wait(barrier_t *barrier);
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struct barrier_t {
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unsigned int lock:
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- internal mutex
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unsigned int left;
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- current barrier count, # of threads still needed.
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unsigned int init_count;
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- number of threads needed for the barrier to continue.
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unsigned int curr_event;
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- generation count
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}
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pthread_barrier_wait(barrier_t *barrier)
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{
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unsigned int event;
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result = 0;
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lll_lock(barrier->lock);
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if (!--barrier->left) {
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barrier->curr_event++;
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futex_wake(&barrier->curr_event, INT_MAX)
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result = BARRIER_SERIAL_THREAD;
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} else {
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event = barrier->curr_event;
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lll_unlock(barrier->lock);
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do {
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futex_wait(&barrier->curr_event, event)
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} while (event == barrier->curr_event);
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}
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if (atomic_increment_val (barrier->left) == barrier->init_count)
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lll_unlock(barrier->lock);
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return result;
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}
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