#ifndef JSLock_h
#define JSLock_h
#include <mutex>
#include <thread>
#include <wtf/Assertions.h>
#include <wtf/Noncopyable.h>
#include <wtf/RefPtr.h>
#include <wtf/ThreadSafeRefCounted.h>
#include <wtf/WTFThreadData.h>
namespace JSC {
class ExecState;
class VM;
class GlobalJSLock {
WTF_MAKE_NONCOPYABLE(GlobalJSLock);
public:
JS_EXPORT_PRIVATE GlobalJSLock();
JS_EXPORT_PRIVATE ~GlobalJSLock();
static void initialize();
private:
static std::mutex* s_sharedInstanceMutex;
};
class JSLockHolder {
public:
JS_EXPORT_PRIVATE JSLockHolder(VM*);
JS_EXPORT_PRIVATE JSLockHolder(VM&);
JS_EXPORT_PRIVATE JSLockHolder(ExecState*);
JS_EXPORT_PRIVATE ~JSLockHolder();
private:
void init();
RefPtr<VM> m_vm;
};
class JSLock : public ThreadSafeRefCounted<JSLock> {
WTF_MAKE_NONCOPYABLE(JSLock);
public:
JSLock(VM*);
JS_EXPORT_PRIVATE ~JSLock();
JS_EXPORT_PRIVATE void lock();
JS_EXPORT_PRIVATE void unlock();
static void lock(ExecState*);
static void unlock(ExecState*);
static void lock(VM&);
static void unlock(VM&);
VM* vm() { return m_vm; }
bool hasExclusiveThread() const { return m_hasExclusiveThread; }
std::thread::id exclusiveThread() const
{
ASSERT(m_hasExclusiveThread);
return m_ownerThreadID;
}
JS_EXPORT_PRIVATE void setExclusiveThread(std::thread::id);
JS_EXPORT_PRIVATE bool currentThreadIsHoldingLock();
void willDestroyVM(VM*);
class DropAllLocks {
WTF_MAKE_NONCOPYABLE(DropAllLocks);
public:
JS_EXPORT_PRIVATE DropAllLocks(ExecState*);
JS_EXPORT_PRIVATE DropAllLocks(VM*);
JS_EXPORT_PRIVATE DropAllLocks(VM&);
JS_EXPORT_PRIVATE ~DropAllLocks();
void setDropDepth(unsigned depth) { m_dropDepth = depth; }
unsigned dropDepth() const { return m_dropDepth; }
private:
intptr_t m_droppedLockCount;
RefPtr<VM> m_vm;
unsigned m_dropDepth;
};
private:
void lock(intptr_t lockCount);
void unlock(intptr_t unlockCount);
void didAcquireLock();
void willReleaseLock();
unsigned dropAllLocks(DropAllLocks*);
void grabAllLocks(DropAllLocks*, unsigned lockCount);
std::mutex m_lock;
std::thread::id m_ownerThreadID;
intptr_t m_lockCount;
unsigned m_lockDropDepth;
bool m_hasExclusiveThread;
VM* m_vm;
AtomicStringTable* m_entryAtomicStringTable;
};
}
#endif // JSLock_h