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Matt Pharr
2011-06-21 06:23:29 -07:00
commit 18af5226ba
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38
examples/mandelbrot_tasks/Makefile Normal file
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ARCH = $(shell uname)
TASK_CXX=tasks_pthreads.cpp
TASK_LIB=-lpthread
ifeq ($(ARCH), Darwin)
TASK_CXX=tasks_gcd.cpp
TASK_LIB=
endif
TASK_OBJ=$(addprefix objs/, $(TASK_CXX:.cpp=.o))
CXX=g++
CXXFLAGS=-Iobjs/ -O3 -Wall
ISPC=ispc
ISPCFLAGS=-O2 --target=sse4x2
default: mandelbrot
.PHONY: dirs clean
dirs:
/bin/mkdir -p objs/
clean:
/bin/rm -rf objs *~ mandelbrot
mandelbrot: dirs objs/mandelbrot.o objs/mandelbrot_serial.o objs/mandelbrot_ispc.o $(TASK_OBJ)
$(CXX) $(CXXFLAGS) -o $@ objs/mandelbrot.o objs/mandelbrot_ispc.o objs/mandelbrot_serial.o $(TASK_OBJ) -lm $(TASK_LIB)
objs/%.o: %.cpp
$(CXX) $< $(CXXFLAGS) -c -o $@
objs/mandelbrot.o: objs/mandelbrot_ispc.h
objs/%_ispc.h objs/%_ispc.o: %.ispc
$(ISPC) $(ISPCFLAGS) $< -o objs/$*_ispc.o -h objs/$*_ispc.h

120
examples/mandelbrot_tasks/mandelbrot.cpp Normal file
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/*
Copyright (c) 2010-2011, Intel Corporation
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 Intel Corporation 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 BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE 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.
*/
#ifdef _MSC_VER
#define _CRT_SECURE_NO_WARNINGS
#define NOMINMAX
#pragma warning (disable: 4244)
#pragma warning (disable: 4305)
#endif
#include <stdio.h>
#include <algorithm>
#include "../timing.h"
#include "mandelbrot_ispc.h"
using namespace ispc;
extern void mandelbrot_serial(float x0, float y0, float x1, float y1,
int width, int height, int maxIterations,
int output[]);
/* Write a PPM image file with the image of the Mandelbrot set */
static void
writePPM(int *buf, int width, int height, const char *fn) {
FILE *fp = fopen(fn, "wb");
fprintf(fp, "P6\n");
fprintf(fp, "%d %d\n", width, height);
fprintf(fp, "255\n");
for (int i = 0; i < width*height; ++i) {
// Map the iteration count to colors by just alternating between
// two greys.
char c = (buf[i] & 0x1) ? 240 : 20;
for (int j = 0; j < 3; ++j)
fputc(c, fp);
}
fclose(fp);
}
int main() {
unsigned int width = 1536;
unsigned int height = 1024;
float x0 = -2;
float x1 = 1;
float y0 = -1;
float y1 = 1;
extern void TasksInit();
TasksInit();
int maxIterations = 512;
int *buf = new int[width*height];
//
// Compute the image using the ispc implementation; report the minimum
// time of three runs.
//
double minISPC = 1e30;
for (int i = 0; i < 3; ++i) {
reset_and_start_timer();
mandelbrot_ispc(x0, y0, x1, y1, width, height, maxIterations, buf);
double dt = get_elapsed_mcycles();
minISPC = std::min(minISPC, dt);
}
printf("[mandelbrot ispc+tasks]:\t[%.3f] million cycles\n", minISPC);
writePPM(buf, width, height, "mandelbrot-ispc.ppm");
// Clear out the buffer
for (unsigned int i = 0; i < width * height; ++i)
buf[i] = 0;
//
// And run the serial implementation 3 times, again reporting the
// minimum time.
//
double minSerial = 1e30;
for (int i = 0; i < 3; ++i) {
reset_and_start_timer();
mandelbrot_serial(x0, y0, x1, y1, width, height, maxIterations, buf);
double dt = get_elapsed_mcycles();
minSerial = std::min(minSerial, dt);
}
printf("[mandelbrot serial]:\t\t[%.3f] millon cycles\n", minSerial);
writePPM(buf, width, height, "mandelbrot-serial.ppm");
printf("\t\t\t\t(%.2fx speedup from ISPC)\n", minSerial/minISPC);
return 0;
}

86
examples/mandelbrot_tasks/mandelbrot.ispc Normal file
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/*
Copyright (c) 2010-2011, Intel Corporation
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 Intel Corporation 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 BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE 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.
*/
static inline int
mandel(float c_re, float c_im, int count) {
float z_re = c_re, z_im = c_im;
int i;
for (i = 0; i < count; ++i) {
if (z_re * z_re + z_im * z_im > 4.)
break;
float new_re = z_re*z_re - z_im*z_im;
float new_im = 2.f * z_re * z_im;
z_re = c_re + new_re;
z_im = c_im + new_im;
}
return i;
}
/* Task to compute the Mandelbrot iterations for a span of scanlines from
[ystart,yend).
*/
task void
mandelbrot_scanlines(uniform int ystart, uniform int yend,
uniform float x0, uniform float dx,
uniform float y0, uniform float dy,
uniform int width, uniform int maxIterations,
reference uniform int output[]) {
for (uniform int j = ystart; j < yend; ++j) {
for (uniform int i = 0; i < width; i += programCount) {
float x = x0 + (programIndex + i) * dx;
float y = y0 + j * dy;
int index = j * width + i + programIndex;
output[index] = mandel(x, y, maxIterations);
}
}
}
export void
mandelbrot_ispc(uniform float x0, uniform float y0,
uniform float x1, uniform float y1,
uniform int width, uniform int height,
uniform int maxIterations, reference uniform int output[]) {
uniform float dx = (x1 - x0) / width;
uniform float dy = (y1 - y0) / height;
/* Launch task to compute results for spans of 'span' scanlines. */
uniform int span = 2;
for (uniform int j = 0; j < height; j += span)
launch < mandelbrot_scanlines(j, j+span, x0, dx, y0, dy, width,
maxIterations, output) >;
}

68
examples/mandelbrot_tasks/mandelbrot_serial.cpp Normal file
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/*
Copyright (c) 2010-2011, Intel Corporation
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 Intel Corporation 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 BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE 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.
*/
static int mandel(float c_re, float c_im, int count) {
float z_re = c_re, z_im = c_im;
int i;
for (i = 0; i < count; ++i) {
if (z_re * z_re + z_im * z_im > 4.)
break;
float new_re = z_re*z_re - z_im*z_im;
float new_im = 2.f * z_re * z_im;
z_re = c_re + new_re;
z_im = c_im + new_im;
}
return i;
}
void mandelbrot_serial(float x0, float y0, float x1, float y1,
int width, int height, int maxIterations,
int output[])
{
float dx = (x1 - x0) / width;
float dy = (y1 - y0) / height;
for (int j = 0; j < height; j++) {
for (int i = 0; i < width; ++i) {
float x = x0 + i * dx;
float y = y0 + j * dy;
int index = (j * width + i);
output[index] = mandel(x, y, maxIterations);
}
}
}

162
examples/mandelbrot_tasks/mandelbrot_tasks.vcxproj Executable file
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<PropertyGroup Label="Globals">
<ProjectGuid>{E80DA7D4-AB22-4648-A068-327307156BE6}</ProjectGuid>
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115
examples/mandelbrot_tasks/tasks_concrt.cpp Normal file
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/*
Copyright (c) 2010-2011, Intel Corporation
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 Intel Corporation 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 BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE 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.
*/
/* Simple task system implementation for ispc based on Microsoft's
Concurrency Runtime. */
#include <windows.h>
#include <concrt.h>
using namespace Concurrency;
#include <assert.h>
#include <stdio.h>
// ispc expects these functions to have C linkage / not be mangled
extern "C" {
void ISPCLaunch(void *f, void *data);
void ISPCSync();
}
typedef void (*TaskFuncType)(void *, int, int);
struct TaskInfo {
TaskFuncType ispcFunc;
void *ispcData;
};
// This is a simple implementation that just aborts if more than MAX_TASKS
// are launched. It could easily be extended to be more general...
#define MAX_TASKS 4096
static int taskOffset;
static TaskInfo taskInfo[MAX_TASKS];
static event *events[MAX_TASKS];
static CRITICAL_SECTION criticalSection;
void
TasksInit() {
InitializeCriticalSection(&criticalSection);
for (int i = 0; i < MAX_TASKS; ++i)
events[i] = new event;
}
void __cdecl
lRunTask(LPVOID param) {
TaskInfo *ti = (TaskInfo *)param;
// Actually run the task.
// FIXME: like the tasks_gcd.cpp implementation, this is passing bogus
// values for the threadIndex and threadCount builtins, which in turn
// will cause bugs in code that uses those. FWIW this example doesn't
// use them...
int threadIndex = 0;
int threadCount = 1;
ti->ispcFunc(ti->ispcData, threadIndex, threadCount);
// Signal the event that this task is done
int taskNum = ti - &taskInfo[0];
events[taskNum]->set();
}
void
ISPCLaunch(void *func, void *data) {
// Get a TaskInfo struct for this task
EnterCriticalSection(&criticalSection);
TaskInfo *ti = &taskInfo[taskOffset++];
assert(taskOffset < MAX_TASKS);
LeaveCriticalSection(&criticalSection);
// And pass it on to the Concurrency Runtime...
ti->ispcFunc = (TaskFuncType)func;
ti->ispcData = data;
CurrentScheduler::ScheduleTask(lRunTask, ti);
}
void ISPCSync() {
event::wait_for_multiple(&events[0], taskOffset, true,
COOPERATIVE_TIMEOUT_INFINITE);
for (int i = 0; i < taskOffset; ++i)
events[i]->reset();
taskOffset = 0;
}

90
examples/mandelbrot_tasks/tasks_gcd.cpp Normal file
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/*
Copyright (c) 2010-2011, Intel Corporation
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 Intel Corporation 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 BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE 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.
*/
/* A simple task system for ispc programs based on Apple's Grand Central
Dispatch. */
#include <dispatch/dispatch.h>
static dispatch_queue_t gcdQueue;
static dispatch_group_t gcdGroup;
// ispc expects these functions to have C linkage / not be mangled
extern "C" {
void ISPCLaunch(void *f, void *data);
void ISPCSync();
}
struct TaskInfo {
void *func;
void *data;
};
void
TasksInit() {
gcdQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
gcdGroup = dispatch_group_create();
}
static void
lRunTask(void *ti) {
typedef void (*TaskFuncType)(void *, int, int);
TaskInfo *taskInfo = (TaskInfo *)ti;
TaskFuncType func = (TaskFuncType)(taskInfo->func);
// FIXME: these are bogus values; may cause bugs in code that depends
// on them having unique values in different threads.
int threadIndex = 0;
int threadCount = 1;
// Actually run the task
func(taskInfo->data, threadIndex, threadCount);
// FIXME: taskInfo leaks...
}
void ISPCLaunch(void *func, void *data) {
TaskInfo *ti = new TaskInfo;
ti->func = func;
ti->data = data;
dispatch_group_async_f(gcdGroup, gcdQueue, ti, lRunTask);
}
void ISPCSync() {
// Wait for all of the tasks in the group to complete before returning
dispatch_group_wait(gcdGroup, DISPATCH_TIME_FOREVER);
}

285
examples/mandelbrot_tasks/tasks_pthreads.cpp Normal file
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/*
Copyright (c) 2010-2011, Intel Corporation
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 Intel Corporation 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 BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE 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 <pthread.h>
#include <semaphore.h>
#include <string.h>
#include <unistd.h>
#include <assert.h>
#include <stdio.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/param.h>
#include <sys/sysctl.h>
#include <stdint.h>
#include <stdlib.h>
#include <errno.h>
#include <vector>
// ispc expects these functions to have C linkage / not be mangled
extern "C" {
void ISPCLaunch(void *f, void *data);
void ISPCSync();
}
static int nThreads;
static pthread_t *threads;
static pthread_mutex_t taskQueueMutex;
static std::vector<std::pair<void *, void *> > taskQueue;
static sem_t *workerSemaphore;
static uint32_t numUnfinishedTasks;
static pthread_mutex_t tasksRunningConditionMutex;
static pthread_cond_t tasksRunningCondition;
static void *lTaskEntry(void *arg);
/** Figure out how many CPU cores there are in the system
*/
static int
lNumCPUCores() {
#if defined(__linux__)
return sysconf(_SC_NPROCESSORS_ONLN);
#else
// Mac
int mib[2];
mib[0] = CTL_HW;
size_t length = 2;
if (sysctlnametomib("hw.logicalcpu", mib, &length) == -1) {
fprintf(stderr, "sysctlnametomib() filed. Guessing 2 cores.");
return 2;
}
assert(length == 2);
int nCores = 0;
size_t size = sizeof(nCores);
if (sysctl(mib, 2, &nCores, &size, NULL, 0) == -1) {
fprintf(stderr, "sysctl() to find number of cores present failed. Guessing 2.");
return 2;
}
return nCores;
#endif
}
void
TasksInit() {
nThreads = lNumCPUCores();
threads = new pthread_t[nThreads];
int err;
if ((err = pthread_mutex_init(&taskQueueMutex, NULL)) != 0) {
fprintf(stderr, "Error creating mutex: %s\n", strerror(err));
exit(1);
}
char name[32];
sprintf(name, "mandelbrot.%d", (int)getpid());
workerSemaphore = sem_open(name, O_CREAT, S_IRUSR|S_IWUSR, 0);
if (!workerSemaphore) {
fprintf(stderr, "Error creating semaphore: %s\n", strerror(err));
exit(1);
}
if ((err = pthread_cond_init(&tasksRunningCondition, NULL)) != 0) {
fprintf(stderr, "Error creating condition variable: %s\n", strerror(err));
exit(1);
}
if ((err = pthread_mutex_init(&tasksRunningConditionMutex, NULL)) != 0) {
fprintf(stderr, "Error creating mutex: %s\n", strerror(err));
exit(1);
}
for (int i = 0; i < nThreads; ++i) {
err = pthread_create(&threads[i], NULL, &lTaskEntry, reinterpret_cast<void *>(i));
if (err != 0) {
fprintf(stderr, "Error creating pthread %d: %s\n", i, strerror(err));
exit(1);
}
}
}
void
ISPCLaunch(void *f, void *d) {
//
// Acquire mutex, add task
//
int err;
if ((err = pthread_mutex_lock(&taskQueueMutex)) != 0) {
fprintf(stderr, "Error from pthread_mutex_lock: %s\n", strerror(err));
exit(1);
}
taskQueue.push_back(std::make_pair(f, d));
if ((err = pthread_mutex_unlock(&taskQueueMutex)) != 0) {
fprintf(stderr, "Error from pthread_mutex_unlock: %s\n", strerror(err));
exit(1);
}
//
// Update count of number of tasks left to run
//
if ((err = pthread_mutex_lock(&tasksRunningConditionMutex)) != 0) {
fprintf(stderr, "Error from pthread_mutex_lock: %s\n", strerror(err));
exit(1);
}
++numUnfinishedTasks;
if ((err = pthread_mutex_unlock(&tasksRunningConditionMutex)) != 0) {
fprintf(stderr, "Error from pthread_mutex_lock: %s\n", strerror(err));
exit(1);
}
//
// Post to the worker semaphore to wake up worker threads that are
// sleeping waiting for tasks to show up
//
if ((err = sem_post(workerSemaphore)) != 0) {
fprintf(stderr, "Error from sem_post: %s\n", strerror(err));
exit(1);
}
}
static void *
lTaskEntry(void *arg) {
int threadIndex = int(reinterpret_cast<int64_t>(arg));
int threadCount = nThreads;
while (true) {
int err;
if ((err = sem_wait(workerSemaphore)) != 0) {
fprintf(stderr, "Error from sem_wait: %s\n", strerror(err));
exit(1);
}
std::pair<void *, void *> myTask;
//
// Acquire mutex, get task
//
if ((err = pthread_mutex_lock(&taskQueueMutex)) != 0) {
fprintf(stderr, "Error from pthread_mutex_lock: %s\n", strerror(err));
exit(1);
}
if (taskQueue.size() == 0) {
//
// Task queue is empty, go back and wait on the semaphore
//
if ((err = pthread_mutex_unlock(&taskQueueMutex)) != 0) {
fprintf(stderr, "Error from pthread_mutex_unlock: %s\n", strerror(err));
exit(1);
}
continue;
}
myTask = taskQueue.back();
taskQueue.pop_back();
if ((err = pthread_mutex_unlock(&taskQueueMutex)) != 0) {
fprintf(stderr, "Error from pthread_mutex_unlock: %s\n", strerror(err));
exit(1);
}
//
// Do work for _myTask_
//
typedef void (*TaskFunType)(void *, int, int);
TaskFunType func = (TaskFunType)myTask.first;
func(myTask.second, threadIndex, threadCount);
//
// Decrement the number of unfinished tasks counter
//
if ((err = pthread_mutex_lock(&tasksRunningConditionMutex)) != 0) {
fprintf(stderr, "Error from pthread_mutex_lock: %s\n", strerror(err));
exit(1);
}
int unfinished = --numUnfinishedTasks;
if (unfinished == 0) {
//
// Signal the "no more tasks are running" condition if all of
// them are done.
//
int err;
if ((err = pthread_cond_signal(&tasksRunningCondition)) != 0) {
fprintf(stderr, "Error from pthread_cond_signal: %s\n", strerror(err));
exit(1);
}
}
if ((err = pthread_mutex_unlock(&tasksRunningConditionMutex)) != 0) {
fprintf(stderr, "Error from pthread_mutex_lock: %s\n", strerror(err));
exit(1);
}
}
pthread_exit(NULL);
return 0;
}
void ISPCSync() {
int err;
if ((err = pthread_mutex_lock(&tasksRunningConditionMutex)) != 0) {
fprintf(stderr, "Error from pthread_mutex_lock: %s\n", strerror(err));
exit(1);
}
// As long as there are tasks running, wait on the condition variable;
// doing so causes this thread to go to sleep until someone signals on
// the tasksRunningCondition condition variable.
while (numUnfinishedTasks > 0) {
if ((err = pthread_cond_wait(&tasksRunningCondition,
&tasksRunningConditionMutex)) != 0) {
fprintf(stderr, "Error from pthread_cond_wait: %s\n", strerror(err));
exit(1);
}
}
// We acquire ownership of the condition variable mutex when the above
// pthread_cond_wait returns.
// FIXME: is there a lurking issue here if numUnfinishedTasks gets back
// to zero by the time we get to ISPCSync() and thence we're trying to
// unlock a mutex we don't have a lock on?
if ((err = pthread_mutex_unlock(&tasksRunningConditionMutex)) != 0) {
fprintf(stderr, "Error from pthread_mutex_lock: %s\n", strerror(err));
exit(1);
}
}