Threads

Posix Threads

Introduction

Example

 #include <pthread.h>
 #include <stdio.h>
 #define NUM_THREADS     5

 void *PrintHello(void *threadid)
 {
   long tid;
   tid = (long)threadid;
   printf("Hello World! It's me, thread #%ld!\n", tid);
   pthread_exit(NULL);
 }

 int main (int argc, char *argv[])
 {
   pthread_t threads[NUM_THREADS];
   int rc;
   long t;
   for(t=0; t<NUM_THREADS; t++){
      printf("In main: creating thread %ld\n", t);
      rc = pthread_create(&threads[t], NULL, PrintHello, (void *)t);
      if (rc){
         printf("ERROR; return code from pthread_create() is %d\n", rc);
         exit(-1);
      }
   }
   pthread_exit(NULL);
 }

 pthread_create(pthread_t* , const pthread_attr_t *, void* (*job)(void*), void* args);
 pthread_exit(void*);
 pthread_join(pthread_t thread, void ** thread_return);
 pthread_t pthread_self(void);
 int pthread_equal(pthread_t thread1, pthread_t thread2);

 int pthread_attr_init(pthread_attr_t * attr);
 int pthread_attr_ ...

Mutexe (Mutual Exclusion Device)

 int pthread_mutex_init(pthread_mutex_t *mutex, const pthread_mutexattr_t *mutex_attr);
 int pthread_mutex_lock(pthread_mutex_t *mutex);

 int pthread_mutex_trylock(pthread_mutex_t *mutex);

 int pthread_mutex_unlock(pthread_mutex_t *mutex);
 int pthread_mutex_destroy(pthread_mutex_t *mutex);