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NAME
     glXInitThreadsSUN - multi-threading support

C SPECIFICATION
     int glXInitThreadsSUN( void )

DESCRIPTION
     The glXInitThreadsSUN function initializes  GL  support  for
     concurrent  rendering  threads.  This function must first be
     called before glXCreateContext in a multi-threaded  GL  pro-
     gram, and it must complete before any other GL call is made.
     This function returns a nonzero status if initialization was
     successful;  otherwise, it returns zero.  On systems that do
     not support threads, this function always returns zero.

     It is only necessary  to  call  this  function  if  multiple
     rendering  threads  might use GL concurrently.  If all calls
     to GL functions are protected by some other access mechanism
     (for  example,  a  mutual  exclusion  lock  in  a toolkit or
     through explicit client programming), GL thread  initializa-
     tion  is  not  required.   It  is  recommended  that single-
     threaded rendering programs not call this function.

     This function is only client side so  the  extension  string
     can be retrieved using glXGetClientString. Typical usage:

     #ifdef GLX_SUN_init_threads
         if ( strstr ( glXGetClientString (dpy, GLX_EXTENSIONS ),
                       "GLX_SUN_init_threads" ) ) {

             if ( ! glXInitThreadsSUN ( ) ) {
                 printf ("Unable to init GL ");
                 printf ("for multithreaded rendering\n");
             }
         }
     #endif

NOTES
     XInitThreads must be called before glXInitThreadsSUN.

     glXQueryExtensionsString does not show  a  string  for  this
     function since this function is client side only.

     glXInitThreadsSUN is part of the GLX_SUN_init_threads exten-
     sion,   not   part   of   the   core  GL  command  set.   If
     GLX_SUN_init_threads is included in the string  returned  by
     glXGetClientString,     when     called     with    argument
     GLX_EXTENSIONS, extension glXInitThreadsSUN is supported  by
     the connection.

SEE ALSO
     glXGetClientString,                glXQueryExtensionsString,
     glXMakeCurrent, XInitThreads

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