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#include <pthread.h>
#include <unistd.h>
#include <stdio.h>
pthread_key_t kKey = 0;
void * ThreadProc(void* arg)
{
char* a = (char*)(arg);
sleep(2);
pthread_setspecific(kKey, a);
sleep(1);
char* str = (char*)pthread_getspecific(kKey);
printf("thread: %s\n", str);
}
int main()
{
pthread_t thread_handle1 = 0;
pthread_t thread_handle2 = 0;
char a[] = {"i am A"};
char b[] = {"i am B"};
pthread_create(&thread_handle1, NULL, ThreadProc, a);
pthread_key_create(&kKey, NULL);
pthread_create(&thread_handle2, NULL, ThreadProc, b);
void* out1 = NULL;
void* out2 = NULL;
pthread_join(thread_handle1, &out1);
pthread_join(thread_handle2, &out2);
return 0;
}
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“the function to pthread_getspecific()  has  been  designed  to  favor speed and simplicity over error reporting”
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redhat:  yum install python-devel
debian:  apt-get install python-dev
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debian:  useradd -m user-name
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