nsz Git - musl/blob - src/thread/pthread_key_create.c

   1 #include "pthread_impl.h"
   2
   3 const size_t __pthread_tsd_size = sizeof(void *) * PTHREAD_KEYS_MAX;
   4 void *__pthread_tsd_main[PTHREAD_KEYS_MAX] = { 0 };
   5
   6 static void (*keys[PTHREAD_KEYS_MAX])(void *);
   7
   8 static void nodtor(void *dummy)
   9 {
  10 }
  11
  12 int pthread_key_create(pthread_key_t *k, void (*dtor)(void *))
  13 {
  14         unsigned i = (uintptr_t)&k / 16 % PTHREAD_KEYS_MAX;
  15         unsigned j = i;
  16
  17         pthread_self();
  18         libc.tsd_keys = keys;
  19         if (!dtor) dtor = nodtor;
  20         do {
  21                 if (!a_cas_p(keys+j, 0, dtor)) {
  22                         *k = j;
  23                         return 0;
  24                 }
  25         } while ((j=(j+1)%PTHREAD_KEYS_MAX) != i);
  26         return EAGAIN;
  27 }
  28
  29 void __pthread_tsd_run_dtors(pthread_t self)
  30 {
  31         int i, j, not_finished = self->tsd_used;
  32         for (j=0; not_finished && j<PTHREAD_DESTRUCTOR_ITERATIONS; j++) {
  33                 not_finished = 0;
  34                 for (i=0; i<PTHREAD_KEYS_MAX; i++) {
  35                         if (self->tsd[i] && keys[i]) {
  36                                 void *tmp = self->tsd[i];
  37                                 self->tsd[i] = 0;
  38                                 keys[i](tmp);
  39                                 not_finished = 1;
  40                         }
  41                 }
  42         }
  43 }