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我试图模拟使用pthreads发送和接收功能。我确实实现了下面的代码。但有时候会挂起或产生错误的结果。使用pthreads模拟发送和接收
int g_sender,g_receiver; //global variables to keep track of the sender and receiver
void send(double ** data,int sender,int receiver, int size[],int block_size){
int i;
pthread_mutex_lock(&lock);
for (i=0;i<size[0];i++)
memcpy(sharedA[i],data[i],size[1]*block_size);
g_sender = sender;
g_receiver = receiver;
sem_wait(&sem);
pthread_mutex_unlock(&lock);
}
void receive(double ** data, int sender,int receiver, int size[],int block_size){
int i;
while(!(sender==g_sender && receiver==g_receiver));
for(i=0;i<size[0];i++)
memcpy(data[i],sharedA[i],size[1]*block_size);
g_sender =-1;
g_receiver = -1;
sem_post(&sem);
}
你觉得我在这里错过了什么?
感谢
我正在使用锁来保护来自其他线程的全局变量sharedA,g_sender,g_receiver,直到从接收器读取它为止。我使用信号来模拟阻塞发送。 – user504453 2012-04-28 08:08:35
@ user504453,总之你的设计对我来说没什么意义 – 2012-04-28 11:02:09