Extract the locking and logging code

The locking code gets its own module, since it's more fundamental
than the higher-level locking code.

Extracting the logging code was the whole point here. :)

1 files changed, 60 insertions, 0 deletions

diff --git a/src/lib/lock/compat_mutex.h b/src/lib/lock/compat_mutex.h
new file mode 100644
index 0000000000..92978086ac
--- /dev/null
+++ b/src/lib/lock/compat_mutex.h
@@ -0,0 +1,60 @@
+/* Copyright (c) 2003-2004, Roger Dingledine
+ * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
+ * Copyright (c) 2007-2018, The Tor Project, Inc. */
+/* See LICENSE for licensing information */
+
+#ifndef TOR_COMPAT_MUTEX_H
+#define TOR_COMPAT_MUTEX_H
+
+#include "orconfig.h"
+#include "lib/cc/torint.h"
+#include "lib/malloc/util_malloc.h"
+
+#if defined(HAVE_PTHREAD_H) && !defined(_WIN32)
+#include <pthread.h>
+#endif
+
+#if defined(_WIN32)
+#include <windows.h>
+#endif
+
+#if defined(_WIN32)
+#define USE_WIN32_THREADS
+#elif defined(HAVE_PTHREAD_H) && defined(HAVE_PTHREAD_CREATE)
+#define USE_PTHREADS
+#else
+#error "No threading system was found"
+#endif /* defined(_WIN32) || ... */
+
+/* Because we use threads instead of processes on most platforms (Windows,
+ * Linux, etc), we need locking for them.  On platforms with poor thread
+ * support or broken gethostbyname_r, these functions are no-ops. */
+
+/** A generic lock structure for multithreaded builds. */
+typedef struct tor_mutex_t {
+#if defined(USE_WIN32_THREADS)
+  /** Windows-only: on windows, we implement locks with CRITICAL_SECTIONS. */
+  CRITICAL_SECTION mutex;
+#elif defined(USE_PTHREADS)
+  /** Pthreads-only: with pthreads, we implement locks with
+   * pthread_mutex_t. */
+  pthread_mutex_t mutex;
+#else
+  /** No-threads only: Dummy variable so that tor_mutex_t takes up space. */
+  int _unused;
+#endif /* defined(USE_WIN32_MUTEX) || ... */
+} tor_mutex_t;
+
+tor_mutex_t *tor_mutex_new(void);
+tor_mutex_t *tor_mutex_new_nonrecursive(void);
+void tor_mutex_init(tor_mutex_t *m);
+void tor_mutex_init_nonrecursive(tor_mutex_t *m);
+void tor_mutex_acquire(tor_mutex_t *m);
+void tor_mutex_release(tor_mutex_t *m);
+void tor_mutex_free_(tor_mutex_t *m);
+#define tor_mutex_free(m) FREE_AND_NULL(tor_mutex_t, tor_mutex_free_, (m))
+void tor_mutex_uninit(tor_mutex_t *m);
+
+void tor_locking_init(void);
+
+#endif /* !defined(TOR_COMPAT_MUTEX_H) */