mBed's Thread::wait() causes interrupts to stop working

[joakimu]

Hi,

We have issues with mBed's Thread::wait() in mBed 5.7.2, which causes our interrupts to stop working. Below is a small example that can be used to test this. By removing Thread::wait(), the code works. It does however work with Thread::wait() for a small time, before it hangs (deadlock?)

#include "mbed.h"

DigitalOut led1(LED1);


#define SIGNAL_EVENT_TIMEOUT        0x0200

static osThreadId  sThreadId = NULL;
static Timeout     sTimeOut;

static void myWaitCallback()
{
    osSignalSet(sThreadId, SIGNAL_EVENT_TIMEOUT);  // Notify thread that the timer has expired
}

static void myWait(float timeOut)
{
    sThreadId = osThreadGetId();
    bool exit = false;
    sTimeOut.attach(myWaitCallback, timeOut);
    while (!exit) {
        osEvent event = osSignalWait(SIGNAL_EVENT_TIMEOUT, osWaitForever);
        if (event.status == osEventSignal) {
            if (event.value.signals & SIGNAL_EVENT_TIMEOUT) {
                exit = true;
            }
        }
    }
    sTimeOut.detach();
}



// main() runs in its own thread in the OS
int main() {
    while (true) {
        led1 = !led1;
        //wait(0.5);
        myWait(0.5);
        Thread::wait(500);
    }
}

[joakimu]

Hi,

Tested your file mbed-thread-wait-test_NRF52840_DK.hex and it blinks fine.

Have been running it for a minute now. I don't understand your hex-file is working and mine isn't.

What compiler version and Mbed version are you using?
Are you building from Linux, Mac or Windows, or perhaps using the Mbed online compiler?

[Jørgen Holmefjord]

It was compiled with GCC_ARM:

arm-none-eabi-gcc --version
arm-none-eabi-gcc (GNU Tools for ARM Embedded Processors) 6.2.1 20161205 (release) [ARM/embedded-6-branch revision 243739]

On Windows 7 machine with mbed CLI v1.2.2, and a clean mbed project with mbed-os-5.7.2 selected in mbed-os directory using the command:

git checkout tags/mbed-os-5.7.2