转载http://blog.csdn.net/relianceslee/article/details/952861同时请参见《unix 网络编程第二卷》
pthread_cond_wait( pthread_cond_t *cptr, pthread_mutex_t *mptr );
当mptr的值不是需要的值时,pthread_cond_wait函数等待之。
- 1.给条件变量发送信号的代码大体如下:
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pthread_mutex_lock( &mutex );
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设置条件为真
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pthread_cond_signal( &cond );
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pthread_mutex_unlock( &mutex );
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2.测试条件并进入睡眠以等待该条件为真的代码大体如下:
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pthread_mutex_lock( &mutex );
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while( 条件为假 )
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{
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pthread_cond_wait( &cond, &mutex );
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}
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修改条件
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pthread_mutex_unlock( &mutex );
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3.为了上锁冲突,1的代码改为如下方式
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pthread_mutex_lock( &mutex );
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dosignal = ( nready.nready == 0 );
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nready++;
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pthread_mutex_unlock( &mutex );
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if( dosignal )
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{
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pthread_cond_signal( &cond );
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}
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