[PATCH] Make wait4 a pthread cancellation point

[Thomas Pfaff]

Attached is a patch and a test case for wait4 (used by wait, wait3 and
waitpid).

2003-01-13  Thomas Pfaff  <tpfaff@gmx.net>

	* wait.cc: Include thread.h
	(wait4): Add pthread_testcancel call.
	Wait for child process and cancellation event.
	* thread.cc: Update list of cancellation points.
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