Does sync(2) block writes until completed? Post: 302239838

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glwaitsync

GLWAITSYNC(3G)							    OpenGL 3.3							    GLWAITSYNC(3G)

NAME

       glWaitSync - instruct the GL server to block until the specified sync object becomes signaled

C SPECIFICATION

       void glWaitSync(GLsync sync, GLbitfield flags, GLuint64 timeout);

PARAMETERS

       sync
	   Specifies the sync object whose status to wait on.

       flags
	   A bitfield controlling the command flushing behavior.  flags may be zero.

       timeout
	   Specifies the timeout that the server should wait before continuing.  timeout must be GL_TIMEOUT_IGNORED.

DESCRIPTION

       glWaitSync causes the GL server to block and wait until sync becomes signaled.  sync is the name of an existing sync object upon which to
       wait.  flags and timeout are currently not used and must be set to zero and the special value GL_TIMEOUT_IGNORED, respectively[1].
       glWaitSync will always wait no longer than an implementation-dependent timeout. The duration of this timeout in nanoseconds may be queried
       by calling glGet() with the parameter GL_MAX_SERVER_WAIT_TIMEOUT. There is currently no way to determine whether glWaitSync unblocked
       because the timeout expired or because the sync object being waited on was signaled.

       If an error occurs, glWaitSync does not cause the GL server to block.

NOTES

       glWaitSync is available only if the GL version is 3.2 or higher.

ERRORS

       GL_INVALID_OPERATION is generated if sync is not the name of a sync object.

       GL_INVALID_VALUE is generated if flags is not zero.

       GL_INVALID_VALUE is generated if timeout is not GL_TIMEOUT_IGNORED.

SEE ALSO

       glFenceSync(), glClientWaitSync()

COPYRIGHT

       Copyright (C) 2010 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication
       License, v 1.0, 8 June 1999.  http://opencontent.org/openpub/.

NOTES

	1. flags and timeout are placeholders for anticipated future extensions of sync object capabilities. They must have these reserved values
	   in order that existing code calling glWaitSync operate properly in the presence of such extensions.

OpenGL 3.3							    03/08/2011							    GLWAITSYNC(3G)