125 lines
2.1 KiB
C++
125 lines
2.1 KiB
C++
// Copyright (c) 1996 James Clark
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// See the file copying.txt for copying permission.
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#ifndef Mutex_INCLUDED
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#define Mutex_INCLUDED 1
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#ifdef SP_MUTEX_WIN32
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#define SP_MUTEX
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#define STRICT 1
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#include <windows.h>
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// <windows.h> appears to turn these warnings back on
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#ifdef _MSC_VER
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#pragma warning ( disable : 4237 )
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#endif
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#ifdef SP_NAMESPACE
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namespace SP_NAMESPACE {
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#endif
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class Mutex {
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public:
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class Lock {
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public:
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Lock(Mutex *mp) : mp_(mp) {
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if (mp) ::EnterCriticalSection(&mp->cs_);
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}
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~Lock() {
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if (mp_) ::LeaveCriticalSection(&mp_->cs_);
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}
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private:
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Mutex *mp_;
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};
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Mutex() {
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::InitializeCriticalSection(&cs_);
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}
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~Mutex() {
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::DeleteCriticalSection(&cs_);
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}
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friend class Lock;
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private:
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CRITICAL_SECTION cs_;
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};
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#ifdef SP_NAMESPACE
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}
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#endif
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#endif /* SP_MUTEX_WIN32 */
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#ifdef SP_MUTEX_MACH
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#define SP_MUTEX
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#ifdef SP_NAMESPACE
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namespace SP_NAMESPACE {
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#endif
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#ifdef SP_NAMESPACE
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}
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#endif
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#endif /* SP_MUTEX_MACH */
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#ifdef SP_MUTEX_PTHREADS
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// Support for pthreads on Linux.
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// Written by Matthias Clasen <clasen@mathematik.uni-freiburg.de>
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#define SP_MUTEX
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extern "C" {
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#include <pthread.h>
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}
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#ifdef SP_NAMESPACE
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namespace SP_NAMESPACE {
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#endif
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class Mutex {
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public:
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class Lock {
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// Lock serves to automatically unlock Mutex, however control leaves
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// a block. Don't let any "warning: unused variable `class Mutex::Lock lock'"
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// mislead you; hopefully your compiler won't optimise this away...
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public:
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Lock(Mutex *mp) : mp_(mp) { if (mp_) pthread_mutex_lock (&mp_->cs_); }
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~Lock() { if (mp_) pthread_mutex_unlock(&mp_->cs_); }
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private:
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Mutex *mp_;
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};
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Mutex() { pthread_mutex_init (&cs_, NULL); }
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~Mutex() { pthread_mutex_destroy (&cs_); }
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friend class Lock;
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private:
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pthread_mutex_t cs_;
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};
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#ifdef SP_NAMESPACE
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}
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#endif
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#endif /* SP_MUTEX_PTHREADS */
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#ifndef SP_MUTEX
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#ifdef SP_NAMESPACE
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namespace SP_NAMESPACE {
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#endif
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class Mutex {
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public:
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class Lock {
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public:
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Lock(Mutex *) { }
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};
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Mutex() { }
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};
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#ifdef SP_NAMESPACE
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}
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#endif
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#endif /* not SP_MUTEX */
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#endif /* not Mutex_INCLUDED */
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