431a9c00a5
On Linux and macOS, using Clang to compile OpenStarbound produces about 400 MB worth of warnings during the build, making the compiler output unreadable and slowing the build down considerably. 99% of the warnings were unqualified uses of std::move and std::forward, which are now all properly qualified. Fixed a few other minor warnings about non-virtual destructors and some uses of std::move preventing copy elision on temporary objects. Most remaining warnings are now unused parameters.
95 lines
2.1 KiB
C++
95 lines
2.1 KiB
C++
#include "StarLockFile.hpp"
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#include "StarTime.hpp"
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#include "StarThread.hpp"
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#include <sys/file.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <unistd.h>
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namespace Star {
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int64_t const LockFile::MaximumSleepMillis;
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Maybe<LockFile> LockFile::acquireLock(String const& filename, int64_t lockTimeout) {
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LockFile lock(std::move(filename));
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if (lock.lock(lockTimeout))
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return lock;
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return {};
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}
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LockFile::LockFile(String const& filename) : m_filename(std::move(filename)) {}
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LockFile::LockFile(LockFile&& lockFile) {
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operator=(std::move(lockFile));
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}
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LockFile::~LockFile() {
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unlock();
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}
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LockFile& LockFile::operator=(LockFile&& lockFile) {
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m_filename = std::move(lockFile.m_filename);
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m_handle = std::move(lockFile.m_handle);
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return *this;
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}
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bool LockFile::lock(int64_t timeout) {
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auto doFLock = [](String const& filename, bool block) -> shared_ptr<int> {
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int fd = open(filename.utf8Ptr(), O_RDONLY | O_CREAT, 0644);
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if (fd < 0)
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throw StarException(strf("Could not open lock file {}, {}\n", filename, strerror(errno)));
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int ret;
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if (block)
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ret = flock(fd, LOCK_EX);
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else
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ret = flock(fd, LOCK_EX | LOCK_NB);
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if (ret != 0) {
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close(fd);
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if (errno != EWOULDBLOCK)
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throw StarException(strf("Could not lock file {}, {}\n", filename, strerror(errno)));
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return {};
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}
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return make_shared<int>(fd);
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};
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if (timeout < 0) {
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m_handle = doFLock(m_filename, true);
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return true;
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} else if (timeout == 0) {
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m_handle = doFLock(m_filename, false);
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return (bool)m_handle;
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} else {
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int64_t startTime = Time::monotonicMilliseconds();
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while (true) {
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m_handle = doFLock(m_filename, false);
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if (m_handle)
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return true;
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if (Time::monotonicMilliseconds() - startTime > timeout)
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return false;
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Thread::sleep(min(timeout / 4, MaximumSleepMillis));
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}
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}
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}
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void LockFile::unlock() {
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if (m_handle) {
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int fd = *(int*)m_handle.get();
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unlink(m_filename.utf8Ptr());
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close(fd);
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m_handle.reset();
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}
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}
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bool LockFile::isLocked() const {
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return (bool)m_handle;
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}
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}
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