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tests/thread_float: do not overload slow MCUs with IRQs #18632

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Jan 4, 2023
Merged

tests/thread_float: do not overload slow MCUs with IRQs #18632

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29 changes: 22 additions & 7 deletions tests/thread_float/main.c
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Original file line number Diff line number Diff line change
Expand Up @@ -23,10 +23,14 @@
#include <stdio.h>
#include <string.h>

#include "thread.h"
#include "board.h"
#include "clk.h"
#include "macros/units.h"
#include "msg.h"
#include "periph_conf.h"
#include "thread.h"
#include "time_units.h"
#include "ztimer.h"
#include "timex.h"

static char t1_stack[THREAD_STACKSIZE_MAIN];
static char t2_stack[THREAD_STACKSIZE_MAIN];
Expand All @@ -36,15 +40,13 @@ static kernel_pid_t p1, p2, p3;

static ztimer_t timer;

#define OFFSET (100)

static mutex_t lock = MUTEX_INIT;

static void timer_cb(void *arg)
{
(void)arg;
uint32_t *timeout = arg;
thread_yield();
ztimer_set(ZTIMER_USEC, &timer, OFFSET);
ztimer_set(ZTIMER_USEC, &timer, *timeout);
}

static void *thread_1_2_3(void *_arg)
Expand Down Expand Up @@ -81,6 +83,16 @@ int main(void)
const char *t2_name = "t2";
const char *t3_name = "t3";

/* Let's not overwhelm boards by firing IRQs faster than they can handle and
* give them 50 billion CPU cycles per timeout.
*
* (Note: The `static` is required as this variable will be accessed from
* the ISR, which will occur even after the main thread has exited.) */
static uint32_t timeout = 0;
/* Note: It must be initialized dynamically, as coreclk() is not
* constant. */
timeout = 50000000000U / coreclk();

p1 = thread_create(t1_stack, sizeof(t1_stack), THREAD_PRIORITY_MAIN + 1,
THREAD_CREATE_WOUT_YIELD | THREAD_CREATE_STACKTEST,
thread_1_2_3, (void *)t1_name, t1_name);
Expand All @@ -92,8 +104,11 @@ int main(void)
thread_1_2_3, (void *)t3_name, t3_name);
puts("THREADS CREATED\n");

printf("Context switch every %" PRIu32 " µs\n", timeout);

timer.callback = timer_cb;
ztimer_set(ZTIMER_USEC, &timer, OFFSET);
timer.arg = &timeout;
ztimer_set(ZTIMER_USEC, &timer, timeout);

return 0;
}