objc/objc_tls.c

   1 #import "objc_tls.h"
   2 #import <objc/objc_arc.h>
   3 #import <pthread.h>
   4
   5 static void objc_tls_free(void *tls) {
   6 }
   7
   8 static pthread_key_t objc_tls_key;
   9
  10 static void createKey() {
  11     pthread_key_create(&objc_tls_key, objc_tls_free);
  12
  13     objc_tls *tls = calloc(1, sizeof(objc_tls));
  14
  15     pthread_setspecific(objc_tls_key, tls);
  16 }
  17
  18 objc_tls *objc_tlsCurrent() {
  19     static pthread_once_t createKeyOnce = PTHREAD_ONCE_INIT;
  20
  21     pthread_once(&createKeyOnce, createKey);
  22
  23     return pthread_getspecific(objc_tls_key);
  24 }