ex10_2.c

来自「linux 高级编程的例子源码,包括了本书上的所有代码」· C语言 代码 · 共 83 行

/*filename:ex7_2.c*/
#include <stdio.h>
#include <errno.h>
#include<pthread.h>
#include<unistd.h>

void *my_thread(void *arg)
{
	int retval=0;
    pthread_attr_t attr;
	struct sched_param param;
	size_t stacksize;
	int detachstate;
	int scope;
    int inherit;
    int policy;

	if (pthread_attr_init(&attr)==0)
	{
		if (pthread_attr_getstacksize(&attr,&stacksize)==0)
		{
			printf("StackSize:%d\n");
		}
		if (pthread_attr_getdetachstate(&attr,&detachstate)==0)
		{
			if (detachstate==PTHREAD_CREATE_JOINABLE)
				printf("DetachState:PTHREAD_CREATE_JOINABLE\n");
			if (detachstate==PTHREAD_CREATE_DETACHED)
				printf("DetachState:PTHREAD_CREATE_DETACHED\n");
		}
		if (pthread_attr_getscope(&attr,&scope)==0)
		{
			if (scope==PTHREAD_SCOPE_PROCESS)
				printf("Scope :PTHREAD_SCOPE_PROCESS\n");
			if (scope==PTHREAD_SCOPE_SYSTEM)
				printf("Scope :PTHREAD_SCOPE_SYSTEM\n");
		}
		if (pthread_attr_getinheritsched(&attr,&inherit)==0)
		{
			if (inherit==PTHREAD_INHERIT_SCHED)
				printf("InheritSched:PTHREAD_INHERIT_SCHED\n");
			if (inherit==PTHREAD_EXPLICIT_SCHED)
				printf("InheritSched:PTHREAD_EXPLICIT_SCHED\n");
		}
		if (pthread_attr_getschedpolicy(&attr,&policy)==0)
		{
			if (policy==SCHED_FIFO)
				printf("SchedPolicy:SCHED_FIFO\n");
			if (policy==SCHED_RR)
				printf("SchedPolicy:SCHED_RR\n");
			else
				printf("SchedPolicy:SCHED_OTHER\n");
		}
		if (pthread_attr_getschedparam(&attr,&param)==0)
		{
			printf("SchedPriority:%d\n",param.sched_priority);
		}
        pthread_attr_destroy (&attr);
	}
	pthread_exit(&retval);

}
int main()
{
	int count;
	pthread_t thread;
	int *retval;
  	
	if (pthread_create(&thread,NULL,my_thread,(void*)NULL)!=0)
	{
		fprintf(stderr,"Count not create thread:%s\n",strerror(errno));
	}		
		
	if (pthread_join(thread,(void **)(&retval))!=0)
	{
		fprintf(stderr,"No thread to join:%s\n",strerror(errno));
	}
	else
	{
		printf("Thread returned %d\n",*retval);
	}
	exit(0);
}