source: asp3_tinet_ecnl_arm/trunk/musl-1.1.18/src/thread/pthread_key_create.c@ 352

#include "pthread_impl.h"

volatile size_t __pthread_tsd_size = sizeof(void *) * PTHREAD_KEYS_MAX;
void *__pthread_tsd_main[PTHREAD_KEYS_MAX] = { 0 };

static void (*volatile keys[PTHREAD_KEYS_MAX])(void *);

static void nodtor(void *dummy)
{
}

int __pthread_key_create(pthread_key_t *k, void (*dtor)(void *))
{
        unsigned i = (uintptr_t)&k / 16 % PTHREAD_KEYS_MAX;
        unsigned j = i;
        pthread_t self = __pthread_self();

        /* This can only happen in the main thread before
         * pthread_create has been called. */
        if (!self->tsd) self->tsd = __pthread_tsd_main;

        if (!dtor) dtor = nodtor;
        do {
                if (!a_cas_p(keys+j, 0, (void *)dtor)) {
                        *k = j;
                        return 0;
                }
        } while ((j=(j+1)%PTHREAD_KEYS_MAX) != i);
        return EAGAIN;
}

int __pthread_key_delete(pthread_key_t k)
{
        keys[k] = 0;
        return 0;
}

void __pthread_tsd_run_dtors()
{
        pthread_t self = __pthread_self();
        int i, j, not_finished = self->tsd_used;
        for (j=0; not_finished && j<PTHREAD_DESTRUCTOR_ITERATIONS; j++) {
                not_finished = 0;
                for (i=0; i<PTHREAD_KEYS_MAX; i++) {
                        if (self->tsd[i] && keys[i]) {
                                void *tmp = self->tsd[i];
                                self->tsd[i] = 0;
                                keys[i](tmp);
                                not_finished = 1;
                        }
                }
        }
}

weak_alias(__pthread_key_delete, pthread_key_delete);
weak_alias(__pthread_key_create, pthread_key_create);