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8228858: Reimplement JVM_RawMonitors to use PlatformMutex

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Reviewed-by: coleenp, dcubed, pchilanomate
This commit is contained in:
David Holmes 2019-08-14 18:26:23 -04:00
parent 517f13e1c6
commit 000a25c0bf
4 changed files with 15 additions and 36 deletions
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19
src/hotspot/share/prims/jvm.cpp
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@ -3384,32 +3384,33 @@ JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
JVM_END
// Raw monitor support //////////////////////////////////////////////////////////////////////
// VM Raw monitor support //////////////////////////////////////////////////////////////////////
// The lock routine below calls lock_without_safepoint_check in order to get a raw lock
// without interfering with the safepoint mechanism. The routines are not JVM_LEAF because
// they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check
// that only works with java threads.
// VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
// lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
// library code. They may be used by JavaThreads and non-JavaThreads and do not participate
// in the safepoint protocol, thread suspension, thread interruption, or anything of that
// nature. JavaThreads will be "in native" when using this API from JDK code.
JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
VM_Exit::block_if_vm_exited();
JVMWrapper("JVM_RawMonitorCreate");
return new Mutex(Mutex::native, "JVM_RawMonitorCreate");
return new os::PlatformMutex();
}
JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
VM_Exit::block_if_vm_exited();
JVMWrapper("JVM_RawMonitorDestroy");
delete ((Mutex*) mon);
delete ((os::PlatformMutex*) mon);
}
JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
VM_Exit::block_if_vm_exited();
JVMWrapper("JVM_RawMonitorEnter");
((Mutex*) mon)->jvm_raw_lock();
((os::PlatformMutex*) mon)->lock();
return 0;
}
@ -3417,7 +3418,7 @@ JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
VM_Exit::block_if_vm_exited();
JVMWrapper("JVM_RawMonitorExit");
((Mutex*) mon)->jvm_raw_unlock();
((os::PlatformMutex*) mon)->unlock();
}