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Replace unnecessary use of atomic in "shared_lock"

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This commit is contained in:
Stephen Seo 2023-07-22 16:45:52 +09:00
parent cf27a6bb76
commit b50e50b5fb
2 changed files with 10 additions and 10 deletions
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16
src/CXX11_shared_spin_lock.cpp
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@ -20,7 +20,7 @@ write(false)
UDPC::LockObj<false> UDPC::SharedSpinLock::spin_read_lock() {
while (true) {
std::lock_guard<std::mutex> lock(mutex);
if (!write.load()) {
if (!write) {
++read;
return LockObj<false>(selfWeakPtr, Badge{});
}
@ -29,7 +29,7 @@ UDPC::LockObj<false> UDPC::SharedSpinLock::spin_read_lock() {
UDPC::LockObj<false> UDPC::SharedSpinLock::try_spin_read_lock() {
std::lock_guard<std::mutex> lock(mutex);
if (!write.load()) {
if (!write) {
++read;
return LockObj<false>(selfWeakPtr, Badge{});
}
@ -39,7 +39,7 @@ UDPC::LockObj<false> UDPC::SharedSpinLock::try_spin_read_lock() {
void UDPC::SharedSpinLock::read_unlock(UDPC::Badge &&badge) {
if (badge.isValid) {
std::lock_guard<std::mutex> lock(mutex);
if (read.load() > 0) {
if (read > 0) {
--read;
badge.isValid = false;
}
@ -49,8 +49,8 @@ void UDPC::SharedSpinLock::read_unlock(UDPC::Badge &&badge) {
UDPC::LockObj<true> UDPC::SharedSpinLock::spin_write_lock() {
while (true) {
std::lock_guard<std::mutex> lock(mutex);
if (!write.load() && read.load() == 0) {
write.store(true);
if (!write && read == 0) {
write = true;
return LockObj<true>(selfWeakPtr, Badge{});
}
}
@ -58,8 +58,8 @@ UDPC::LockObj<true> UDPC::SharedSpinLock::spin_write_lock() {
UDPC::LockObj<true> UDPC::SharedSpinLock::try_spin_write_lock() {
std::lock_guard<std::mutex> lock(mutex);
if (!write.load() && read.load() == 0) {
write.store(true);
if (!write && read == 0) {
write = true;
return LockObj<true>(selfWeakPtr, Badge{});
}
return LockObj<true>(Badge{});
@ -68,7 +68,7 @@ UDPC::LockObj<true> UDPC::SharedSpinLock::try_spin_write_lock() {
void UDPC::SharedSpinLock::write_unlock(UDPC::Badge &&badge) {
if (badge.isValid) {
std::lock_guard<std::mutex> lock(mutex);
write.store(false);
write = false;
badge.isValid = false;
}
}

4
src/CXX11_shared_spin_lock.hpp
View file

@ -84,8 +84,8 @@ private:
Weak selfWeakPtr;
std::mutex mutex;
std::atomic_uint read;
std::atomic_bool write;
unsigned int read;
bool write;
};