[PATCH] pthread_mutex patches

[Thomas Pfaff]

This is my patch from 2002-09-17 ported to the recent cygwin src. (See
http://cygwin.com/ml/cygwin-patches/2002-q3/msg00436.html).

pthread_cond_init patch should be applied first.

2002-12-04  Thomas Pfaff <tpfaff@gmx.net>

        * include/pthread.h: Add define for errorchecking mutexes.
        Chang default mutex type.
        * thread.cc (pthread_cond::TimedWait): Update mutex unlock calls.
	(pthread_mutex::pthread_mutex): New implement.
        (pthread_mutex::~pthread_mutex): Ditto.
        (pthread_mutex::Lock): Ditto.
        (pthread_mutex::TryLock): Ditto.
        (pthread_mutex::UnLock): Ditto.
        (pthread_mutex::Destroy): Implement new method.
        (pthread_mutex::SetOwner): Ditto.
	(pthread_mutex::LockRecursive): Ditto.
        (pthread_mutex::fixup_after_fork): Restore locking state after
	fork.
        (__pthread_mutex_destroy): Call pthread_mutex::Destroy to destroy
        mutex.
        (__pthread_mutexattr_settype): Allow errorchecking and recursive
        types.
        * thread.h (MUTEX_LOCK_COUNTER_INITIAL): New define.
	(pthread_mutex::criticalsection): Remove.
        (pthread_mutex::lock_counter): New member.
        (pthread_mutex::recursion_counter): Ditto.
        (pthread_mutex::owner): Ditto.
        (pthread_mutex::type): Ditto.
        (pthread_mutex::Destroy): New method.
        (pthread_mutex::SetOwner): Ditto.
        (pthread_mutex::LockRecursive): Ditto.
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