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8174231: Factor out and share PlatformEvent and Parker code for POSIX systems

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Reviewed-by: stuefe, rehn, dcubed
This commit is contained in:
David Holmes 2017-05-30 17:14:52 -04:00
parent 84ba3ee3b8
commit 3a8c8edb86
10 changed files with 647 additions and 1369 deletions
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71
hotspot/src/os/linux/vm/os_linux.hpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 1999, 2016, Oracle and/or its affiliates. All rights reserved.
* 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
@ -160,7 +160,6 @@ class Linux {
static sigset_t* unblocked_signals();
static sigset_t* vm_signals();
static sigset_t* allowdebug_blocked_signals();
// For signal-chaining
static struct sigaction *get_chained_signal_action(int sig);
@ -207,13 +206,6 @@ class Linux {
static bool os_version_is_known();
static uint32_t os_version();
// pthread_cond clock suppport
private:
static pthread_condattr_t _condattr[1];
public:
static pthread_condattr_t* condAttr() { return _condattr; }
// Stack repair handling
// none present
@ -302,65 +294,4 @@ class Linux {
}
};
class PlatformEvent : public CHeapObj<mtInternal> {
private:
double CachePad[4]; // increase odds that _mutex is sole occupant of cache line
volatile int _Event;
volatile int _nParked;
pthread_mutex_t _mutex[1];
pthread_cond_t _cond[1];
double PostPad[2];
Thread * _Assoc;
public: // TODO-FIXME: make dtor private
~PlatformEvent() { guarantee(0, "invariant"); }
public:
PlatformEvent() {
int status;
status = pthread_cond_init(_cond, os::Linux::condAttr());
assert_status(status == 0, status, "cond_init");
status = pthread_mutex_init(_mutex, NULL);
assert_status(status == 0, status, "mutex_init");
_Event = 0;
_nParked = 0;
_Assoc = NULL;
}
// Use caution with reset() and fired() -- they may require MEMBARs
void reset() { _Event = 0; }
int fired() { return _Event; }
void park();
void unpark();
int park(jlong millis); // relative timed-wait only
void SetAssociation(Thread * a) { _Assoc = a; }
};
class PlatformParker : public CHeapObj<mtInternal> {
protected:
enum {
REL_INDEX = 0,
ABS_INDEX = 1
};
int _cur_index; // which cond is in use: -1, 0, 1
pthread_mutex_t _mutex[1];
pthread_cond_t _cond[2]; // one for relative times and one for abs.
public: // TODO-FIXME: make dtor private
~PlatformParker() { guarantee(0, "invariant"); }
public:
PlatformParker() {
int status;
status = pthread_cond_init(&_cond[REL_INDEX], os::Linux::condAttr());
assert_status(status == 0, status, "cond_init rel");
status = pthread_cond_init(&_cond[ABS_INDEX], NULL);
assert_status(status == 0, status, "cond_init abs");
status = pthread_mutex_init(_mutex, NULL);
assert_status(status == 0, status, "mutex_init");
_cur_index = -1; // mark as unused
}
};
#endif // OS_LINUX_VM_OS_LINUX_HPP