From 1fd5e000ace55b323124c7e556a7a864b972a5c4 Mon Sep 17 00:00:00 2001 From: Christopher Faylor Date: Thu, 17 Feb 2000 19:38:33 +0000 Subject: import winsup-2000-02-17 snapshot --- winsup/cygwin/sync.h | 48 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) create mode 100644 winsup/cygwin/sync.h (limited to 'winsup/cygwin/sync.h') diff --git a/winsup/cygwin/sync.h b/winsup/cygwin/sync.h new file mode 100644 index 000000000..18cff7800 --- /dev/null +++ b/winsup/cygwin/sync.h @@ -0,0 +1,48 @@ +/* sync.h: Header file for cygwin synchronization primitives. + + Copyright 1999 Cygnus Solutions. + + Written by Christopher Faylor + +This file is part of Cygwin. + +This software is a copyrighted work licensed under the terms of the +Cygwin license. Please consult the file "CYGWIN_LICENSE" for +details. */ + +/* FIXME: Note that currently this class cannot be allocated via `new' since + there are issues with malloc and fork. */ +class muto +{ + LONG sync; /* Used to serialize access to this class. */ + LONG visits; /* Count of number of times a thread has called acquire. */ + LONG waiters; /* Number of threads waiting for lock. */ + HANDLE bruteforce; /* event handle used to control waiting for lock. */ + DWORD tid; /* Thread Id of lock owner. */ +public: + void *operator new (size_t, void *p) {return p;} + void *operator new (size_t n) {return ::new muto; } + void operator delete (void *p) {;} /* can't handle allocated mutos + currently */ + + /* This simple constructor is used for cases where no bruteforce + event handling is required. */ + muto(): sync(0), visits(0), waiters(-1), bruteforce(0), tid(0) {;} + /* A more complicated constructor. */ + muto(int inh, const char *name); + ~muto (); + int acquire (DWORD ms = INFINITE); /* Acquire the lock. */ + int release (); /* Release the lock. */ + + /* Return true if caller thread owns the lock. */ + int ismine () {return tid == GetCurrentThreadId ();} +}; + +/* Use a statically allocated buffer as the storage for a muto */ +#define new_muto(__inh, __name) \ +({ \ + static NO_COPY char __mbuf[sizeof(class muto) + 100] = {0}; \ + muto *m; \ + m = new (__mbuf) muto ((__inh), (__name)); \ + m; \ +}) -- cgit v1.2.3