everything everywhere

all at once

1 files changed, 121 insertions, 0 deletions

diff --git a/source/core/StarThread.cpp b/source/core/StarThread.cpp
new file mode 100644
index 0000000..e76d25c
--- /dev/null
+++ b/source/core/StarThread.cpp
@@ -0,0 +1,121 @@
+#include "StarThread.hpp"
+#include "StarFormat.hpp"
+
+namespace Star {
+
+ReadersWriterMutex::ReadersWriterMutex()
+  : m_readers(), m_writers(), m_readWaiters(), m_writeWaiters() {}
+
+void ReadersWriterMutex::readLock() {
+  MutexLocker locker(m_mutex);
+  if (m_writers || m_writeWaiters) {
+    m_readWaiters++;
+    while (m_writers || m_writeWaiters)
+      m_readCond.wait(m_mutex);
+    m_readWaiters--;
+  }
+  m_readers++;
+}
+
+bool ReadersWriterMutex::tryReadLock() {
+  MutexLocker locker(m_mutex);
+  if (m_writers || m_writeWaiters)
+    return false;
+  m_readers++;
+  return true;
+}
+
+void ReadersWriterMutex::readUnlock() {
+  MutexLocker locker(m_mutex);
+  m_readers--;
+  if (m_writeWaiters)
+    m_writeCond.signal();
+}
+
+void ReadersWriterMutex::writeLock() {
+  MutexLocker locker(m_mutex);
+  if (m_readers || m_writers) {
+    m_writeWaiters++;
+    while (m_readers || m_writers)
+      m_writeCond.wait(m_mutex);
+    m_writeWaiters--;
+  }
+  m_writers = 1;
+}
+
+bool ReadersWriterMutex::tryWriteLock() {
+  MutexLocker locker(m_mutex);
+  if (m_readers || m_writers)
+    return false;
+  m_writers = 1;
+  return true;
+}
+
+void ReadersWriterMutex::writeUnlock() {
+  MutexLocker locker(m_mutex);
+  m_writers = 0;
+  if (m_writeWaiters)
+    m_writeCond.signal();
+  else if (m_readWaiters)
+    m_readCond.broadcast();
+}
+
+ReadLocker::ReadLocker(ReadersWriterMutex& rwlock, bool startLocked) : m_lock(rwlock), m_locked(false) {
+  if (startLocked)
+    lock();
+}
+
+ReadLocker::~ReadLocker() {
+  unlock();
+}
+
+void ReadLocker::unlock() {
+  if (m_locked)
+    m_lock.readUnlock();
+  m_locked = false;
+}
+
+void ReadLocker::lock() {
+  if (!m_locked)
+    m_lock.readLock();
+  m_locked = true;
+}
+
+bool ReadLocker::tryLock() {
+  if (!m_locked) {
+    m_locked = m_lock.tryReadLock();
+    return m_locked;
+  }
+  return true;
+}
+
+WriteLocker::WriteLocker(ReadersWriterMutex& rwlock, bool startLocked) : m_lock(rwlock), m_locked(false) {
+  if (startLocked)
+    lock();
+}
+
+WriteLocker::~WriteLocker() {
+  unlock();
+}
+
+void WriteLocker::unlock() {
+  if (m_locked)
+    m_lock.writeUnlock();
+  m_locked = false;
+}
+
+void WriteLocker::lock() {
+  if (!m_locked)
+    m_lock.writeLock();
+  m_locked = true;
+}
+
+bool WriteLocker::tryLock() {
+  if (!m_locked) {
+    m_locked = m_lock.tryWriteLock();
+    return m_locked;
+  }
+  return true;
+}
+
+}