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greatly simplify pthread_key_create (~20% size reduction)

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This commit is contained in:
Rich Felker 2011-03-31 19:04:56 -04:00
commit c9806fc2f9
1 changed files with 9 additions and 10 deletions
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19
src/thread/pthread_key_create.c
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@ -9,18 +9,17 @@ static void nodtor(void *dummy)
int pthread_key_create(pthread_key_t *k, void (*dtor)(void *)) int pthread_key_create(pthread_key_t *k, void (*dtor)(void *))
{ {
static void (*keys[PTHREAD_KEYS_MAX])(void *); static void (*keys[PTHREAD_KEYS_MAX])(void *);
int i = (uintptr_t)&k / 16 % PTHREAD_KEYS_MAX; unsigned i = (uintptr_t)&k / 16 % PTHREAD_KEYS_MAX;
int j = i; unsigned j = i;
pthread_self(); pthread_self();
libc.tsd_keys = keys; libc.tsd_keys = keys;
if (!dtor) dtor = nodtor; if (!dtor) dtor = nodtor;
/* Cheap trick - &k cannot match any destructor pointer */ do {
while (a_cas_p(keys+j, 0, &k) if (!a_cas_p(keys+j, 0, dtor)) {
&& (j=(j+1)%PTHREAD_KEYS_MAX) != i); *k = j;
if (keys[j] != (void (*)(void *))&k) return 0;
return EAGAIN; }
keys[j] = dtor; } while ((j=(j+1)%PTHREAD_KEYS_MAX) != i);
*k = j; return EAGAIN;
return 0;
} }