void glDeleteProgram(GLuint program);
If a program object is in use as part of current rendering state, it will be flagged for deletion, but it will not be deleted until it is no longer part of current state for any rendering context. If a program object to be deleted has shader objects attached to it, those shader objects will be automatically detached but not deleted unless they have already been flagged for deletion by a previous call to glDeleteShader(). A value of 0 for program will be silently ignored.
To determine whether a program object has been flagged for deletion, call glGetProgram() with arguments program and GL_DELETE_STATUS.
glGetProgram() with arguments program and GL_DELETE_STATUS
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