8189941: Implementation JEP 312: Thread-local handshake
Summary: 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.
Reviewed-by: mdoerr, neliasso, acorn, aph, coleenp, dholmes
Contributed-by: mikael.gerdin@oracle.com, erik.osterlund@oracle.com, robbin.ehn@oracle.com
/*
* Copyright (c) 1999, 2017, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#ifndef CPU_SPARC_VM_GLOBALDEFINITIONS_SPARC_HPP
#define CPU_SPARC_VM_GLOBALDEFINITIONS_SPARC_HPP
// Size of Sparc Instructions
const int BytesPerInstWord = 4;
const int StackAlignmentInBytes = (2*wordSize);
// Indicates whether the C calling conventions require that
// 32-bit integer argument values are extended to 64 bits.
const bool CCallingConventionRequiresIntsAsLongs = true;
#define SUPPORTS_NATIVE_CX8
// The expected size in bytes of a cache line, used to pad data structures.
#if defined(TIERED)
// tiered, 64-bit, large machine
#define DEFAULT_CACHE_LINE_SIZE 128
#elif defined(COMPILER1)
// pure C1, 32-bit, small machine
#define DEFAULT_CACHE_LINE_SIZE 16
#elif defined(COMPILER2)
// pure C2, 64-bit, large machine
#define DEFAULT_CACHE_LINE_SIZE 128
#endif
#if defined(SOLARIS)
#define SUPPORT_RESERVED_STACK_AREA
#endif
// SPARC have implemented the local polling
#define THREAD_LOCAL_POLL
#endif // CPU_SPARC_VM_GLOBALDEFINITIONS_SPARC_HPP