pthread_t type and use 0 to indicate a lock has no owner. Added a
'locked' boolean field explicitly to PRLock. In PRMonitor, make the
owner field a PRThread* pointer, with a value of NULL indicating that
the monitor has no owner. Thanks to Takis Psarogiannakopoulos for
reporting this bug and spending a year (off and on) tracking it down.
Modified files: _pth.h, primpl.h, and ptsynch.c.
git-svn-id: svn://10.0.0.236/trunk@96353 18797224-902f-48f8-a5cc-f745e15eee43
ccbf7f70c5