72 lines
1.9 KiB
C++
72 lines
1.9 KiB
C++
/* sync.h: Header file for cygwin synchronization primitives.
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Copyright 1999, 2000, 2001, 2002, 2003, 2004 Red Hat, Inc.
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Written by Christopher Faylor <cgf@cygnus.com>
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#ifndef _SYNC_H
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#define _SYNC_H
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/* FIXME: Note that currently this class cannot be allocated via `new' since
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there are issues with malloc and fork. */
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class muto
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{
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public:
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const char *name;
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private:
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static DWORD exiting_thread;
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LONG sync; /* Used to serialize access to this class. */
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LONG waiters; /* Number of threads waiting for lock. */
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HANDLE bruteforce; /* event handle used to control waiting for lock. */
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public:
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LONG visits; /* Count of number of times a thread has called acquire. */
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void *tls; /* Tls of lock owner. */
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// class muto *next;
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/* The real constructor. */
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muto *init (const char *) __attribute__ ((regparm (2)));
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#if 0 /* FIXME: See comment in sync.cc */
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~muto ()
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#endif
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int acquire (DWORD ms = INFINITE) __attribute__ ((regparm (2))); /* Acquire the lock. */
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int release () __attribute__ ((regparm (1))); /* Release the lock. */
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bool acquired () __attribute__ ((regparm (1)));
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void upforgrabs () {tls = this;} // just set to an invalid address
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void grab () __attribute__ ((regparm (1)));
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operator int () const {return !!name;}
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static void set_exiting_thread () {exiting_thread = GetCurrentThreadId ();}
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};
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class lock_process
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{
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bool skip_unlock;
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static muto locker;
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public:
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static void init () {locker.init ("lock_process");}
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lock_process (bool exiting = false)
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{
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locker.acquire ();
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skip_unlock = exiting;
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if (exiting && exit_state < ES_SET_MUTO)
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{
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exit_state = ES_SET_MUTO;
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muto::set_exiting_thread ();
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}
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}
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~lock_process ()
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{
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if (!skip_unlock)
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locker.release ();
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}
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friend class dtable;
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};
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#endif /*_SYNC_H*/
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