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8189941: Implementation JEP 312: Thread-local handshake

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Introduce a way to execute a callback on threads without performing a global VM safepoint. Make it both possible and cheap to stop individual threads and not just all threads or none.

Co-authored-by: Mikael Gerdin <mikael.gerdin@oracle.com>
Co-authored-by: Erik Osterlund <erik.osterlund@oracle.com>
Reviewed-by: mdoerr, neliasso, acorn, aph, coleenp, dholmes
This commit is contained in:
Robbin Ehn 2017-08-31 10:00:28 +02:00
parent fdee542113
commit 104ecb2dd1
73 changed files with 1847 additions and 325 deletions
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6
src/hotspot/share/jvmci/jvmciCodeInstaller.cpp
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@ -37,6 +37,7 @@
#include "oops/oop.inline.hpp"
#include "oops/objArrayOop.inline.hpp"
#include "runtime/javaCalls.hpp"
#include "runtime/safepointMechanism.inline.hpp"
#include "utilities/align.hpp"
// frequently used constants
@ -854,9 +855,10 @@ JVMCIEnv::CodeInstallResult CodeInstaller::initialize_buffer(CodeBuffer& buffer,
}
last_pc_offset = pc_offset;
if (SafepointSynchronize::do_call_back()) {
JavaThread* thread = JavaThread::current();
if (SafepointMechanism::poll(thread)) {
// this is a hacky way to force a safepoint check but nothing else was jumping out at me.
ThreadToNativeFromVM ttnfv(JavaThread::current());
ThreadToNativeFromVM ttnfv(thread);
}
}