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// Copyright 2015 The Emscripten Authors. All rights reserved.
// Emscripten is available under two separate licenses, the MIT license and the
// University of Illinois/NCSA Open Source License. Both these licenses can be
// found in the LICENSE file.
#include <stdio.h>
#include <stdlib.h>
#include <memory.h>
#include <pthread.h>
#include <emscripten.h>
#include <emscripten/threading.h>
#include <assert.h>
#if !defined(__EMSCRIPTEN_PTHREADS__) || __EMSCRIPTEN_PTHREADS__ != 1
#error __EMSCRIPTEN_PTHREADS__ should have been defined to be equal to 1 when building with pthreads support enabled!
#endif
#define NUM_THREADS 8
volatile unsigned char globalUchar = 0;
volatile unsigned short globalUshort = 0;
volatile unsigned int globalUint = 0;
volatile float globalFloat = 0.0f;
volatile double globalDouble = 0.0;
const int N = 10;
int sharedData[N] = {};
struct Test
{
int op;
int threadId;
};
uint64_t threadCasAccumulatedWrittenData[NUM_THREADS] = {};
uint64_t threadCasAccumulatedReadData[NUM_THREADS] = {};
int rand_32()
{
return (int)(emscripten_random() * float(0x3FFFFFFF));
}
void *ThreadMain(void *arg)
{
// Do some stdio to test proxying to the main thread.
printf("pthread %p starting\n", arg);
assert(pthread_self() != 0);
assert(globalUchar == 5);
assert(globalUshort == 5);
assert(globalUint == 5);
assert(globalFloat == 5.0f);
assert(globalDouble == 5.0);
struct Test *t = (struct Test*)arg;
EM_ASM(out('Thread ' + $0 + ' for test ' + $1 + ': starting computation.'), t->threadId, t->op);
for(int i = 0; i < 99999; ++i)
for(int j = 0; j < N; ++j)
{
switch(t->op)
{
case 0: emscripten_atomic_add_u32(&sharedData[j], 1); break;
case 1: emscripten_atomic_sub_u32(&sharedData[j], 1); break;
case 2: emscripten_atomic_and_u32(&sharedData[j], ~(1UL << t->threadId)); break;
case 3: emscripten_atomic_or_u32(&sharedData[j], 1UL << t->threadId); break;
case 4: emscripten_atomic_xor_u32(&sharedData[j], 1UL << t->threadId); break;
case 5:
{
// Atomically load and store data, and test that each individual u8 is the same.
int data = emscripten_atomic_load_u32(&sharedData[j]);
uint8_t dataU8[4];
memcpy(dataU8, &data, 4);
assert(dataU8[0] >= 10 && dataU8[0] < 10+NUM_THREADS);
assert(dataU8[0] == dataU8[1] && dataU8[0] == dataU8[2] && dataU8[0] == dataU8[3]);
dataU8[0] = dataU8[1] = dataU8[2] = dataU8[3] = 10 + t->threadId;
memcpy(&data, dataU8, 4);
emscripten_atomic_store_u32(&sharedData[j], data);
}
break;
case 6:
{
int newData = rand_32();
int data;
int prevData;
do {
data = emscripten_atomic_load_u32(&sharedData[j]);
prevData = emscripten_atomic_cas_u32(&sharedData[j], data, newData);
} while(prevData != data);
threadCasAccumulatedReadData[t->threadId] += data;
threadCasAccumulatedWrittenData[t->threadId] += newData;
}
break;
}
}
EM_ASM(out('Thread ' + $0 + ' for test ' + $1 + ': finished, exit()ing.'), t->threadId, t->op);
pthread_exit(0);
}
struct Test t[NUM_THREADS] = {};
pthread_t thread[NUM_THREADS];
void RunTest(int test)
{
pthread_attr_t attr;
pthread_attr_init(&attr);
pthread_attr_setstacksize(&attr, 4*1024);
printf("Main thread has thread ID %d\n", (int)pthread_self());
assert(pthread_self() != 0);
switch(test)
{
case 2: memset(sharedData, 0xFF, sizeof(sharedData)); break;
case 5: memset(sharedData, 0x10, sizeof(sharedData)); break;
default: memset(sharedData, 0, sizeof(sharedData)); break;
}
EM_ASM(out('Main: Starting test ' + $0), test);
for(int i = 0; i < NUM_THREADS; ++i)
{
t[i].op = test;
t[i].threadId = i;
int rc = pthread_create(&thread[i], &attr, ThreadMain, &t[i]);
assert(rc == 0);
}
pthread_attr_destroy(&attr);
for(int i = 0; i < NUM_THREADS; ++i)
{
int status = 1;
int rc = pthread_join(thread[i], (void**)&status);
assert(rc == 0);
assert(status == 0);
}
int val = sharedData[0];
EM_ASM(out('Main: Test ' + $0 + ' finished. Result: ' + $1), test, val);
if (test != 6)
{
for(int i = 1; i < N; ++i)
assert(sharedData[i] == sharedData[0]);
}
}
int main()
{
globalUchar = 4;
globalUshort = 4;
globalUint = 4;
globalFloat = 5.0f;
globalDouble = 5.0;
uint8_t prevUchar = emscripten_atomic_add_u8((void*)&globalUchar, 1); assert(prevUchar == 4);
uint16_t prevUshort = emscripten_atomic_add_u16((void*)&globalUshort, 1); assert(prevUshort == 4);
uint32_t prevUint = emscripten_atomic_add_u32((void*)&globalUint, 1); assert(prevUint == 4);
emscripten_atomic_fence();
__sync_synchronize();
for(int i = 0; i < 7; ++i)
RunTest(i);
uint64_t totalRead = 0;
uint64_t totalWritten = 0;
for(int i = 0; i < NUM_THREADS; ++i)
{
totalRead += threadCasAccumulatedReadData[i];
totalWritten += threadCasAccumulatedWrittenData[i];
}
for(int i = 0; i < N; ++i)
totalRead += sharedData[i];
if (totalRead == totalWritten)
printf("totalRead: %llu, totalWritten: %llu\n", totalRead, totalWritten);
else
printf("32-bit CAS test failed! totalRead != totalWritten (%llu != %llu)\n", totalRead, totalWritten);
printf("Main: Test successfully finished.\n");
assert(totalRead == totalWritten);
return 0;
}
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