mirror of
https://gitlab.torproject.org/tpo/core/tor.git
synced 2024-12-06 19:41:15 +01:00
Nick Mathewson
67 lines
1.9 KiB
C
67 lines
1.9 KiB
C
/* Copyright (c) 2003-2004, Roger Dingledine
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* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
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* Copyright (c) 2007-2019, The Tor Project, Inc. */
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/* See LICENSE for licensing information */
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/**
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* \file compat_mutex.h
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*
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* \brief Header for compat_mutex.c
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**/
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#ifndef TOR_COMPAT_MUTEX_H
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#define TOR_COMPAT_MUTEX_H
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#include "orconfig.h"
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#include "lib/cc/torint.h"
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#include "lib/malloc/malloc.h"
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#if defined(HAVE_PTHREAD_H) && !defined(_WIN32)
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#include <pthread.h>
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#endif
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#if defined(_WIN32)
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#include <windows.h>
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#endif
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#if defined(_WIN32)
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#define USE_WIN32_THREADS
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#elif defined(HAVE_PTHREAD_H) && defined(HAVE_PTHREAD_CREATE)
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#define USE_PTHREADS
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#else
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#error "No threading system was found"
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#endif /* defined(_WIN32) || ... */
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/* Because we use threads instead of processes on most platforms (Windows,
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* Linux, etc), we need locking for them. On platforms with poor thread
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* support or broken gethostbyname_r, these functions are no-ops. */
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/** A generic lock structure for multithreaded builds. */
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typedef struct tor_mutex_t {
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#if defined(USE_WIN32_THREADS)
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/** Windows-only: on windows, we implement locks with CRITICAL_SECTIONS. */
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CRITICAL_SECTION mutex;
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#elif defined(USE_PTHREADS)
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/** Pthreads-only: with pthreads, we implement locks with
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* pthread_mutex_t. */
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pthread_mutex_t mutex;
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#else
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/** No-threads only: Dummy variable so that tor_mutex_t takes up space. */
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int _unused;
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#endif /* defined(USE_WIN32_THREADS) || ... */
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} tor_mutex_t;
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tor_mutex_t *tor_mutex_new(void);
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tor_mutex_t *tor_mutex_new_nonrecursive(void);
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void tor_mutex_init(tor_mutex_t *m);
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void tor_mutex_init_nonrecursive(tor_mutex_t *m);
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void tor_mutex_acquire(tor_mutex_t *m);
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void tor_mutex_release(tor_mutex_t *m);
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void tor_mutex_free_(tor_mutex_t *m);
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#define tor_mutex_free(m) FREE_AND_NULL(tor_mutex_t, tor_mutex_free_, (m))
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void tor_mutex_uninit(tor_mutex_t *m);
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void tor_locking_init(void);
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#endif /* !defined(TOR_COMPAT_MUTEX_H) */
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