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Abstract directory locking into util.cpp

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This commit is contained in:
MeshCollider 2017-12-26 19:41:55 +13:00
parent 5260a4aca1
commit 2f3bd47d44
4 changed files with 27 additions and 36 deletions
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22
src/util.cpp
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@ -72,6 +72,7 @@
#include <boost/algorithm/string/case_conv.hpp> // for to_lower()
#include <boost/algorithm/string/predicate.hpp> // for startswith() and endswith()
#include <boost/interprocess/sync/file_lock.hpp>
#include <boost/program_options/detail/config_file.hpp>
#include <boost/thread.hpp>
#include <openssl/crypto.h>
@ -375,6 +376,27 @@ int LogPrintStr(const std::string &str)
return ret;
}
bool LockDirectory(const fs::path& directory, const std::string lockfile_name, bool probe_only)
{
fs::path pathLockFile = directory / lockfile_name;
FILE* file = fsbridge::fopen(pathLockFile, "a"); // empty lock file; created if it doesn't exist.
if (file) fclose(file);
try {
static std::map<std::string, boost::interprocess::file_lock> locks;
boost::interprocess::file_lock& lock = locks.emplace(pathLockFile.string(), pathLockFile.string().c_str()).first->second;
if (!lock.try_lock()) {
return false;
}
if (probe_only) {
lock.unlock();
}
} catch (const boost::interprocess::interprocess_exception& e) {
return error("Error while attempting to lock directory %s: %s", directory.string(), e.what());
}
return true;
}
/** Interpret string as boolean, for argument parsing */
static bool InterpretBool(const std::string& strValue)
{