SDL_CondWait及SDL_CondSignal

SDL_CondWait及SDL_CondSignal

SDL_CondWaitName

SDL_CondWait -- Wait on a condition variable

Synopsis#include "SDL.h"#include "SDL_thread.h"int SDL_CondWait(SDL_cond *cond, SDL_mutex *mut);Description

Unlock the provided mutex and wait for another thread to call SDL_CondSignal or SDL_CondBroadcast on the condition variable cond, then re-lock the mutex and return. The mutex must be locked before entering this function. Returns 0 when it is signalled, or -1 on an error.

即打开mutex ，等待 cond满足后调用SDL_CondSignal orSDL_CondBroadcast，之后re-lock the mutex

SDL_CondSignalName

SDL_CondSignal -- Restart a thread wait on a condition variable

Synopsis#include "SDL.h"#include "SDL_thread.h"int SDL_CondSignal(SDL_cond *cond);Description

Restart one of the threads that are waiting on the condition variable, cond. Returns 0 on success or -1 on an error.

其实这个函数的功能就是解除SDL_CondWait的等待。