You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
265 lines
8.5 KiB
265 lines
8.5 KiB
/* Copyright (c) 2015, The Linux Foundation. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are
|
|
* met:
|
|
* * Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* * Redistributions in binary form must reproduce the above
|
|
* copyright notice, this list of conditions and the following
|
|
* disclaimer in the documentation and/or other materials provided
|
|
* with the distribution.
|
|
* * Neither the name of The Linux Foundation, nor the names of its
|
|
* contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
|
|
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
|
|
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
|
|
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
|
|
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
|
|
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
|
|
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
*/
|
|
#include <LocThread.h>
|
|
#include <string.h>
|
|
#include <pthread.h>
|
|
|
|
class LocThreadDelegate {
|
|
LocRunnable* mRunnable;
|
|
bool mJoinable;
|
|
pthread_t mThandle;
|
|
pthread_mutex_t mMutex;
|
|
int mRefCount;
|
|
~LocThreadDelegate();
|
|
LocThreadDelegate(LocThread::tCreate creator, const char* threadName,
|
|
LocRunnable* runnable, bool joinable);
|
|
void destroy();
|
|
public:
|
|
static LocThreadDelegate* create(LocThread::tCreate creator,
|
|
const char* threadName, LocRunnable* runnable, bool joinable);
|
|
void stop();
|
|
// bye() is for the parent thread to go away. if joinable,
|
|
// parent must stop the spawned thread, join, and then
|
|
// destroy(); if detached, the parent can go straight
|
|
// ahead to destroy()
|
|
inline void bye() { mJoinable ? stop() : destroy(); }
|
|
inline bool isRunning() { return (NULL != mRunnable); }
|
|
static void* threadMain(void* arg);
|
|
};
|
|
|
|
// it is important to note that internal members must be
|
|
// initialized to values as if pthread_create succeeds.
|
|
// This is to avoid the race condition between the threads,
|
|
// once the thread is created, some of these values will
|
|
// be check in the spawned thread, and must set correctly
|
|
// then and there.
|
|
// However, upon pthread_create failure, the data members
|
|
// must be set to indicate failure, e.g. mRunnable, and
|
|
// threashold approprietly for destroy(), e.g. mRefCount.
|
|
LocThreadDelegate::LocThreadDelegate(LocThread::tCreate creator,
|
|
const char* threadName, LocRunnable* runnable, bool joinable) :
|
|
mRunnable(runnable), mJoinable(joinable), mThandle(NULL),
|
|
mMutex(PTHREAD_MUTEX_INITIALIZER), mRefCount(2) {
|
|
|
|
// set up thread name, if nothing is passed in
|
|
if (!threadName) {
|
|
threadName = "LocThread";
|
|
}
|
|
|
|
// create the thread here, then if successful
|
|
// and a name is given, we set the thread name
|
|
if (creator) {
|
|
mThandle = creator(threadName, threadMain, this);
|
|
} else if (pthread_create(&mThandle, NULL, threadMain, this)) {
|
|
// pthread_create() failed
|
|
mThandle = NULL;
|
|
}
|
|
|
|
if (mThandle) {
|
|
// set thread name
|
|
char lname[16];
|
|
int len = sizeof(lname) - 1;
|
|
memcpy(lname, threadName, len);
|
|
lname[len] = 0;
|
|
// set the thread name here
|
|
pthread_setname_np(mThandle, lname);
|
|
|
|
// detach, if not joinable
|
|
if (!joinable) {
|
|
pthread_detach(mThandle);
|
|
}
|
|
} else {
|
|
// must set these values upon failure
|
|
mRunnable = NULL;
|
|
mJoinable = false;
|
|
mRefCount = 1;
|
|
}
|
|
}
|
|
|
|
inline
|
|
LocThreadDelegate::~LocThreadDelegate() {
|
|
// at this point nothing should need done any more
|
|
}
|
|
|
|
// factory method so that we could return NULL upon failure
|
|
LocThreadDelegate* LocThreadDelegate::create(LocThread::tCreate creator,
|
|
const char* threadName, LocRunnable* runnable, bool joinable) {
|
|
LocThreadDelegate* thread = NULL;
|
|
if (runnable) {
|
|
thread = new LocThreadDelegate(creator, threadName, runnable, joinable);
|
|
if (thread && !thread->isRunning()) {
|
|
thread->destroy();
|
|
thread = NULL;
|
|
}
|
|
}
|
|
|
|
return thread;
|
|
}
|
|
|
|
// The order is importang
|
|
// NULLing mRunnalbe stops the while loop in threadMain()
|
|
// join() if mJoinble must come before destroy() call, as
|
|
// the obj must remain alive at this time so that mThandle
|
|
// remains valud.
|
|
void LocThreadDelegate::stop() {
|
|
// mRunnable and mJoinable are reset on different triggers.
|
|
// mRunnable may get nulled on the spawned thread's way out;
|
|
// or here.
|
|
// mJouinable (if ever been true) gets falsed when client
|
|
// thread triggers stop, with either a stop()
|
|
// call or the client releases thread obj handle.
|
|
if (mRunnable) {
|
|
mRunnable = NULL;
|
|
}
|
|
if (mJoinable) {
|
|
mJoinable = false;
|
|
pthread_join(mThandle, NULL);
|
|
}
|
|
// call destroy() to possibly delete the obj
|
|
destroy();
|
|
}
|
|
|
|
// method for clients to call to release the obj
|
|
// when it is a detached thread, the client thread
|
|
// and the spawned thread can both try to destroy()
|
|
// asynchronously. And we delete this obj when
|
|
// mRefCount becomes 0.
|
|
void LocThreadDelegate::destroy() {
|
|
// else case shouldn't happen, unless there is a
|
|
// leaking obj. But only our code here has such
|
|
// obj, so if we test our code well, else case
|
|
// will never happen
|
|
if (mRefCount > 0) {
|
|
// we need a flag on the stack
|
|
bool callDelete = false;
|
|
|
|
// critical section between threads
|
|
pthread_mutex_lock(&mMutex);
|
|
// last destroy() call
|
|
callDelete = (1 == mRefCount--);
|
|
pthread_mutex_unlock(&mMutex);
|
|
|
|
// upon last destroy() call we delete this obj
|
|
if (callDelete) {
|
|
delete this;
|
|
}
|
|
}
|
|
}
|
|
|
|
void* LocThreadDelegate::threadMain(void* arg) {
|
|
LocThreadDelegate* locThread = (LocThreadDelegate*)(arg);
|
|
|
|
if (locThread) {
|
|
LocRunnable* runnable = locThread->mRunnable;
|
|
|
|
if (runnable) {
|
|
if (locThread->isRunning()) {
|
|
runnable->prerun();
|
|
}
|
|
|
|
while (locThread->isRunning() && runnable->run());
|
|
|
|
if (locThread->isRunning()) {
|
|
runnable->postrun();
|
|
}
|
|
|
|
// at this time, locThread->mRunnable may or may not be NULL
|
|
// NULL it just to be safe and clean, as we want the field
|
|
// in the released memory slot to be NULL.
|
|
locThread->mRunnable = NULL;
|
|
delete runnable;
|
|
}
|
|
locThread->destroy();
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
LocThread::~LocThread() {
|
|
if (mThread) {
|
|
mThread->bye();
|
|
mThread = NULL;
|
|
}
|
|
}
|
|
|
|
bool LocThread::start(tCreate creator, const char* threadName, LocRunnable* runnable, bool joinable) {
|
|
bool success = false;
|
|
if (!mThread) {
|
|
mThread = LocThreadDelegate::create(creator, threadName, runnable, joinable);
|
|
// true only if thread is created successfully
|
|
success = (NULL != mThread);
|
|
}
|
|
return success;
|
|
}
|
|
|
|
void LocThread::stop() {
|
|
if (mThread) {
|
|
mThread->stop();
|
|
mThread = NULL;
|
|
}
|
|
}
|
|
|
|
#ifdef __LOC_DEBUG__
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
|
|
class LocRunnableTest1 : public LocRunnable {
|
|
int mID;
|
|
public:
|
|
LocRunnableTest1(int id) : LocRunnable(), mID(id) {}
|
|
virtual bool run() {
|
|
printf("LocRunnableTest1: %d\n", mID++);
|
|
sleep(1);
|
|
return true;
|
|
}
|
|
};
|
|
|
|
// on linux command line:
|
|
// compile: g++ -D__LOC_HOST_DEBUG__ -D__LOC_DEBUG__ -g -std=c++0x -I. -I../../../../vendor/qcom/proprietary/gps-internal/unit-tests/fakes_for_host -I../../../../system/core/include -lpthread LocThread.cpp
|
|
// test detached thread: valgrind ./a.out 0
|
|
// test joinable thread: valgrind ./a.out 1
|
|
int main(int argc, char** argv) {
|
|
LocRunnableTest1 test(10);
|
|
|
|
LocThread thread;
|
|
thread.start("LocThreadTest", test, atoi(argv[1]));
|
|
|
|
sleep(10);
|
|
|
|
thread.stop();
|
|
|
|
sleep(5);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#endif
|