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util/system.cpp: add thread safety annotations for dir_locks

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This commit is contained in:
Anthony Towns 2020-02-11 16:15:37 +10:00
parent a788789948
commit e685ca1992
1 changed files with 7 additions and 6 deletions
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13
src/util/system.cpp
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@ -3,6 +3,7 @@
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <sync.h>
#include <util/system.h>
#include <chainparamsbase.h>
@ -75,18 +76,18 @@ const char * const BITCOIN_CONF_FILENAME = "bitcoin.conf";
ArgsManager gArgs;
/** Mutex to protect dir_locks. */
static Mutex cs_dir_locks;
/** A map that contains all the currently held directory locks. After
* successful locking, these will be held here until the global destructor
* cleans them up and thus automatically unlocks them, or ReleaseDirectoryLocks
* is called.
*/
static std::map<std::string, std::unique_ptr<fsbridge::FileLock>> dir_locks;
/** Mutex to protect dir_locks. */
static std::mutex cs_dir_locks;
static std::map<std::string, std::unique_ptr<fsbridge::FileLock>> dir_locks GUARDED_BY(cs_dir_locks);
bool LockDirectory(const fs::path& directory, const std::string lockfile_name, bool probe_only)
{
std::lock_guard<std::mutex> ulock(cs_dir_locks);
LOCK(cs_dir_locks);
fs::path pathLockFile = directory / lockfile_name;
// If a lock for this directory already exists in the map, don't try to re-lock it
@ -110,13 +111,13 @@ bool LockDirectory(const fs::path& directory, const std::string lockfile_name, b
void UnlockDirectory(const fs::path& directory, const std::string& lockfile_name)
{
std::lock_guard<std::mutex> lock(cs_dir_locks);
LOCK(cs_dir_locks);
dir_locks.erase((directory / lockfile_name).string());
}
void ReleaseDirectoryLocks()
{
std::lock_guard<std::mutex> ulock(cs_dir_locks);
LOCK(cs_dir_locks);
dir_locks.clear();
}