GLFINISH() MachTen Programmer’s Manual GLFINISH()

NAME
glFinish - block until all GL execution is complete

C SPECIFICATION
void glFinish( void )

DESCRIPTION
glFinish does not return until the effects of all previ-
ously called GL commands are complete. Such effects
include all changes to GL state, all changes to connection
state, and all changes to the frame buffer contents.

NOTES
glFinish requires a round trip to the server.

ERRORS
GL_INVALID_OPERATION is generated if glFinish is executed
between the execution of glBegin and the corresponding
execution of glEnd.