glClientWaitSync - block and wait for a sync object to become signaled
GLenum glClientWaitSync(GLsync sync, GLbitfield flags, GLuint64 timeout);
glClientWaitSync causes the client to block and wait for the sync object specified by sync to become signaled. If sync is signaled when glClientWaitSync is called, glClientWaitSync returns immediately, otherwise it will block and wait for up to timeout nanoseconds for sync to become signaled.
The return value is one of four status values:
glClientWaitSync is available only if the GL version is 3.2 or greater.
GL_INVALID_VALUE is generated if sync is not the name of an existing sync object.
GL_INVALID_VALUE is generated if flags contains any unsupported flag.
glFenceSync(), glIsSync() glWaitSync()
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