C++调JS上层的4种方法
1、EM_ASM方法
test.cpp
#include
#include
#include
extern "C"
{
EMSCRIPTEN_KEEPALIVE
void *decodeHEVC(void* time)
{
int *iter=(int*) time;
for(int i=0;i<20;i++)
{
if(i%5==0)
{
printf("5 de beishu\n");
}
}
printf("decodeHEVC\n");
EM_ASM_INT({
callRender($0,5,6);
console.log('test.cpp EM_ASM_INT P:'+$0);
},100 );//调用JS上层函数-》不可行
return time;
}
EMSCRIPTEN_KEEPALIVE
int test() {
pthread_t timer_thread_sub;
int times = 40;
int timerCreateRess=pthread_create(&timer_thread_sub,NULL,decodeHEVC,(void*)×);
printf("sun pthread_create:%d\n",timerCreateRess);
if(timerCreateRess)
{
perror("sub Thread create failed");
return NULL;
}
int timerJoinRess=pthread_join(timer_thread_sub,NULL);
printf("sun pthread_join:%d\n",timerJoinRess);
if(timerJoinRess)
{
perror("sub Thread join failed");
return NULL;
}
printf("sub fibonacci 40 : %d\n",times);
//EM_ASM_INT({
// callRender($0,5,6);
// console.log('test.cpp EM_ASM_INT P:'+$0);
//},100 );//调用JS上层函数-》不可行
return 0;
}
}
test.html
2、EM_JS方法
test.cpp
#include
#include
#include
EM_JS(void, call_alert, (int a, int b, int c), {
callRender(a,b,c);
console.log("test.cpp EM_JS,nihao!");
});
extern "C"
{
EMSCRIPTEN_KEEPALIVE
void *decodeHEVC(void* time)
{
int *iter=(int*) time;
for(int i=0;i<20;i++)
{
if(i%5==0)
{
printf("5 de beishu\n");
}
}
printf("decodeHEVC\n");
call_alert(5,6,7);//调用JS上层函数-》不可行
return time;
}
EMSCRIPTEN_KEEPALIVE
int test() {
pthread_t timer_thread_sub;
int times = 40;
int timerCreateRess=pthread_create(&timer_thread_sub,NULL,decodeHEVC,(void*)×);
printf("sun pthread_create:%d\n",timerCreateRess);
if(timerCreateRess)
{
perror("sub Thread create failed");
return NULL;
}
int timerJoinRess=pthread_join(timer_thread_sub,NULL);
printf("sun pthread_join:%d\n",timerJoinRess);
if(timerJoinRess)
{
perror("sub Thread join failed");
return NULL;
}
printf("sub fibonacci 40 : %d\n",times);
//call_alert(5,6,7);//可行
return 0;
}
}
test.html
3、EMSCRIPTEN_RUN_SCRIPT方法
test.cpp
#include
#include
#include
extern "C"
{
EMSCRIPTEN_KEEPALIVE
void *decodeHEVC(void* time)
{
int *iter=(int*) time;
for(int i=0;i<20;i++)
{
if(i%5==0)
{
printf("5 de beishu\n");
}
}
printf("decodeHEVC\n");
emscripten_run_script("callRender(3,4,56)");//回调JS上层方法
return time;
}
EMSCRIPTEN_KEEPALIVE
int test() {
pthread_t *timer_thread_sub;
int times = 40;
int timerCreateRess=pthread_create(&timer_thread_sub,NULL,decodeHEVC,(void*)×);
printf("sun pthread_create:%d\n",timerCreateRess);
if(timerCreateRess)
{
perror("sub Thread create failed");
return NULL;
}
int timerJoinRess=pthread_join(timer_thread_sub,NULL);
printf("sun pthread_join:%d\n",timerJoinRess);
if(timerJoinRess)
{
perror("sub Thread join failed");
return NULL;
}
printf("sub fibonacci 40 : %d\n",times);
//emscripten_run_script("callRender(3,4,56)");
return 0;
}
}
test.html
4、在JS中实现C++ API
test.cpp
#include
#include
#include
extern "C"
{
extern void my_js(int size);
EMSCRIPTEN_KEEPALIVE
void *decodeHEVC(void* time)
{
int *iter=(int*) time;
for(int i=0;i<20;i++)
{
if(i%5==0)
{
printf("5 de beishu\n");
}
}
printf("decodeHEVC\n");
my_js(505050505);//调用JS上层函数-》跨线程回调
return time;
}
EMSCRIPTEN_KEEPALIVE
int test() {
pthread_t timer_thread_sub;
int times = 40;
int timerCreateRess=pthread_create(&timer_thread_sub,NULL,decodeHEVC,(void*)×);
printf("sun pthread_create:%d\n",timerCreateRess);
if(timerCreateRess)
{
perror("sub Thread create failed");
return NULL;
}
int timerJoinRess=pthread_join(timer_thread_sub,NULL);
printf("sun pthread_join:%d\n",timerJoinRess);
if(timerJoinRess)
{
perror("sub Thread join failed");
return NULL;
}
printf("sub fibonacci 40 : %d\n",times);
//my_js(5);//可行
return 0;
}
}
testlibrary.js
mergeInto(LibraryManager.library, {
my_js__proxy:'async',
my_js__sig:'viii',
my_js: function(iSize) {
callBuffer(iSize);
console.log('testlibrary.js isize:'+iSize);
},
});test.html
编译脚本
emcc test.cpp -o test.js -s EXPORTED_FUNCTIONS="['_test']" --js-library testlibrary.js -s USE_PTHREADS=1 -s PTHREAD_POOL_SIZE=4