Flash::media::Sound pthread problem

Question

When i start these two thread together the application freeze.
Each thread on its own works !
#include <pthread.h>
#include <Flash++.h>
using namespace AS3::ui;
pthread_t audiothread;
pthread_t tickThread;
static var sampleDataEventListener(void *arg, var as3Args)
    flash::events::SampleDataEvent event = var(as3Args[0]);
    flash::utils::ByteArray data = event->data;
    printf("info: sampleDataEventListener write zero---\n");
     for ( unsigned int c = 0; c < 8192; c++ )
        data->writeFloat(0.0f);
    return internal::_undefined;
static void *sampleDataThreadProc(void *arg)
    printf("Create sound object\n");
    flash::media::Sound sound = flash::media::Sound::_new(internal::_null, internal::_null);
    sound->addEventListener(flash::events::SampleDataEvent::SAMPLE_DATA, Function::_new(sampleDataEventListener, NULL), false, 0, false);
    sound->play(0, 0, internal::_null);
    AS3_GoAsync();
    printf("Error: GoAsync returned!\n");
    return NULL;
** Tick thread
void *tickThreadProc(void *colorArg) {
    printf("TickThread start\n");
    int i = 0;
    while(i < 20)
        usleep(80*1000);
        printf("tick\n");
        i++;
    printf("TickThread done!!\n");
    return NULL;
** main method
int main()
    printf("init console\n");
    pthread_create(&audiothread, NULL, sampleDataThreadProc, NULL);
    pthread_create(&tickThread, NULL, tickThreadProc, NULL);
    AS3_GoAsync();
    return 0;
The application freeze with the output:
init console
Create sound object
TickThread start
tick
tick
tick
My build call is:
"$(FLASCC)/usr/bin/g++" $(BASE_CFLAGS) flash++ui.cpp -lAS3++ -lFlash++ -symbol-abc=Console.abc -pthread -O1 -swf-size=500x500 -emit-swf -o flashui.swf
My console.as can be found here:  http://pastebin.com/ngkbcdYC
I tried to init the console in both ways (CModule.startAsync(this) and CModule.startBackground(this, new <String>[], new <String>[]))  which doesn't make a diffrence.
I also tried to set the -swf-version=18 parameter, but it doesn't make a difference, too.
Anyone has an idea what is wrong ?
Thanks !

Answer 1

It may be that the calls to printf() are causing the problem. The printf() function may or may not be thread-safe or reentrant, depending on the system. Perhaps you might enable printf in only one of the threads, run it, and then enable it only in the other thread, and see what happens (easy test to make). If you are more ambitious, you could wrap the printf calls in a mutex. Generally, some folks recommend doing an explicit flush...