mybooksources/Chapter03/code/linuxtls.cpp

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

//线程局部存储key
pthread_key_t thread_log_key;

void write_to_thread_log(const char* message)
{
	if (message == NULL)
		return;
	
	FILE* logfile = (FILE*)pthread_getspecific(thread_log_key);
	fprintf(logfile, "%s\n", message);
	fflush(logfile);
} 

void close_thread_log(void* logfile)
{
	char logfilename[128];
	sprintf(logfilename, "close logfile: thread%ld.log\n", (unsigned long)pthread_self());
	printf(logfilename);
	
	fclose((FILE *)logfile);
} 

void* thread_function(void* args)
{
	char logfilename[128];
	sprintf(logfilename, "thread%ld.log", (unsigned long)pthread_self());
	
	FILE* logfile = fopen(logfilename, "w");
	if (logfile != NULL)
	{
		pthread_setspecific(thread_log_key, logfile);
	
		write_to_thread_log("Thread starting...");
	}
	
	return NULL;
} 

int main()
{
	pthread_t threadIDs[5];	
	pthread_key_create(&thread_log_key, close_thread_log);
	for(int i = 0; i < 5; ++i)
	{
		pthread_create(&threadIDs[i], NULL, thread_function, NULL);
	}
	
	for(int i = 0; i < 5; ++i)
	{
		pthread_join(threadIDs[i], NULL);
	}
	
	return 0;
}