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#if defined __STDC_VERSION__ && __STDC_VERSION__ >= 201101L
static struct per_thread *per_thread(void)
{
_Thread_local static struct per_thread pt = {0};
return &pt;
}
#elif defined _POSIX_C_SOURCE && _POSIX_C_SOURCE >= 199506L
#include <pthread.h>
static pthread_key_t __per_thread_key;
static void _make_key(void)
{
pthread_key_create(&key, NULL);
}
static struct per_thread *per_thread(void)
{
static pthread_once_t key_once = PTHREAD_ONCE_INIT;
struct per_thread *pt;
pthread_once(&key_once, make_key);
if ((pt = pthread_getspecific(key)) == NULL) {
pt = calloc(1, sizeof (*pt));
pthread_setspecific(key, pt);
}
return pt;
}
#else
static struct per_thread *per_thread(void)
{
static struct per_thread pt = {0};
return &pt;
}
#endif
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