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_init();
  18         if (!dtor) dtor = nodtor;
  19         do {
  20                 if (!a_cas_p(keys+j, 0, dtor)) {
  21                         *k = j;
  22                         return 0;
  23                 }
  24         } while ((j=(j+1)%PTHREAD_KEYS_MAX) != i);
  25         return EAGAIN;
  26 }
  27
  28 int pthread_key_delete(pthread_key_t k)
  29 {
  30         keys[k] = 0;
  31         return 0;
  32 }
  33
  34 void __pthread_tsd_run_dtors()
  35 {
  36         pthread_t self = __pthread_self();
  37         int i, j, not_finished = self->tsd_used;
  38         for (j=0; not_finished && j<PTHREAD_DESTRUCTOR_ITERATIONS; j++) {
  39                 not_finished = 0;
  40                 for (i=0; i<PTHREAD_KEYS_MAX; i++) {
  41                         if (self->tsd[i] && keys[i]) {
  42                                 void *tmp = self->tsd[i];
  43                                 self->tsd[i] = 0;
  44                                 keys[i](tmp);
  45                                 not_finished = 1;
  46                         }
  47                 }
  48         }
  49 }