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-rw-r--r--gps/utils/LocThread.cpp266
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diff --git a/gps/utils/LocThread.cpp b/gps/utils/LocThread.cpp
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--- a/gps/utils/LocThread.cpp
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-/* 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>
-#include <loc_pla.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((pthread_t)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 = (pthread_t)NULL;
- }
-
- if (mThandle) {
- // set thread name
- char lname[16];
- int len = (sizeof(lname)>sizeof(threadName)) ?
- (sizeof(threadName) -1):(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
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