Commit [9a59a1] Maximize Restore History

* mutex.c (pthread_mutexattr_settype): New; allow

the following types of mutex:
PTHREAD_MUTEX_DEFAULT
PTHREAD_MUTEX_NORMAL
PTHREAD_MUTEX_ERRORCHECK
PTHREAD_MUTEX_RECURSIVE
(pthread_mutex_lock): Process the lock request
according to the mutex type.

* mutex.c: No longer use Win32 mutexes as the
basis of POSIX mutexes when TryEnterCriticalSection
isn't supported; implement our own versions of
ptw32_{Initialize,Delete,TryEnter,Enter,Leave}CriticalSection
functions to emulate TryEnterCriticalSection when
it isn't supported by the system; don't allow recursive
mutex locks (similar to PTHREAD_MUTEX_ERRORCHECK
on other systems).
- Thomas Pfaff <tpfaff@gmx.net>

rpj rpj 2001-02-06

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