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  1. ÓÃÀ´ÊµÏÖ errno

  2. ÓÃÀ´Ä£Äâ macos É쵀 __thread (tls), http://alex.tapmania.org/2011/03/simple-thread-local-storage-with-pthreads.html

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#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>

void mydtor(void *data)
{
        printf("dtor = %p\n", data);
        free(data);
}

void *mythr1(void *arg)
{
        char *data = malloc(10);
        pthread_key_t key = (pthread_key_t) arg;

        printf("thr #1 data1 = %p\n", data);
        pthread_setspecific(key, data);
        sleep(1);

        data = pthread_getspecific(key);
        printf("thr #1 data2 = %p\n", data);

        return (void *)0;
}

void *mythr2(void *arg)
{
        char *data = malloc(10);
        pthread_key_t key = (pthread_key_t) arg;

        sleep(1);
        printf("thr #2 data1 = %p\n", data);
        pthread_setspecific(key, data);

        data = pthread_getspecific(key);
        printf("thr #2 data2 = %p\n", data);

        return (void *)0;
}

int main()
{
        pthread_t pid1, pid2;
        pthread_key_t key;

        pthread_key_create(&key, mydtor);

        pthread_create(&pid1, NULL, mythr1, (void *)key);
        pthread_create(&pid2, NULL, mythr2, (void *)key);

        pthread_join(pid1, NULL);
        pthread_join(pid2, NULL);

        pthread_key_delete(key);
        return 0;
}
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$ ./a.out
thr #1 data1 = 0x804c3f0
thr #2 data1 = 0x804c400
thr #2 data2 = 0x804c400
dtor = 0x804c400
thr #1 data2 = 0x804c3f0
dtor = 0x804c3f0
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