1

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <pthread.h>

void *thread_function(void *arg)

{

	int i;

	for (i=0; i<5; i++){

		printf("Thread says hi!\n");

		sleep(1);

	}

	return NULL;

}

int main(void)

{

	pthread_t mythread;

	if ( pthread_create( &mythread, NULL, thread_function, NULL) ){

		printf("error creating thread.\n");

		abort();

	}

	if ( pthread_join( mythread, NULL )){

		printf("error joining thread.");

		abort();

	}

	exit(0);

}

gcc -o pthread1 pthread1.c -lpthread

2

#cat thread2.c

#include <pthread.h>

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

int myglobal;

void *thread_function(void *arg)

{

	int i,j;

	for (i=0; i<20; i++){

		i=myglobal;

		j=j+1;

		printf(".");

		fflush(stdout);

		sleep(1);

		myglobal=j;

	}

	return NULL;

}

int main(void)

{

	pthread_t mythread;

	int i;

	if (pthread_create(&mythread, NULL, thread_function, NULL)){

		printf("Error creating thread.");

		abort();

	}

	for (i=0; i<20; i++){

		myglobal=myglobal+1;

		printf("o");

		fflush(stdout);

		sleep(1);

	}

	if (pthread_join(mythread, NULL)){

		printf("Error joining.");

		abort();

	}

	printf("\nmyglobal equals %d\n ",myglobal);

	exit(0);

}

3. Use mutex

#cat thread3.c

#include <stdio.h>

#include <pthread.h>

#include <unistd.h>

#include <stdlib.h>

int myglobal;

pthread_mutex_t mymutex=PTHREAD_MUTEX_INITIALIZER;

void *thread_function(void *arg)

{

	int i,j;

	for (i=0; i<10; i++){

		pthread_mutex_lock(&mymutex);

		j=myglobal;

		j=j+1;

		printf(".");

		fflush(stdout);

		sleep(1);

		myglobal=j;

		pthread_mutex_unlock(&mymutex);

	}

	return NULL;

}

int main(void)

{

	pthread_t mythread;

	int i;

	if (pthread_create(&mythread, NULL, thread_function, NULL)){

		printf("Error creating function;");

		abort();

	}

	for (i=0; i<10; i++){

		pthread_mutex_lock(&mymutex);

		myglobal=myglobal+1;

		pthread_mutex_unlock(&mymutex);

		printf("o");

		fflush(stdout);

		sleep(1);

	}

	if (pthread_join(mythread, NULL)){

		printf("Error joining thread.");

		abort();

	}

	printf("myglobal equals %d\n",myglobal);

	exit(0);

}

REF

https://www.ibm.com/developerworks/cn/linux/thread/posix_thread2/index.html

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