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-rw-r--r--projects/hsm/hsm.c5
-rw-r--r--task.c16
-rw-r--r--task.h1
3 files changed, 21 insertions, 1 deletions
diff --git a/projects/hsm/hsm.c b/projects/hsm/hsm.c
index 8a8f441..33342c0 100644
--- a/projects/hsm/hsm.c
+++ b/projects/hsm/hsm.c
@@ -380,6 +380,11 @@ void hal_task_yield(void)
task_yield();
}
+void hal_task_yield_maybe(void)
+{
+ task_yield_maybe();
+}
+
/* A mutex to arbitrate concurrent access to the keystore.
*/
task_mutex_t ks_mutex = { 0 };
diff --git a/task.c b/task.c
index b0028e7..36e8580 100644
--- a/task.c
+++ b/task.c
@@ -83,12 +83,16 @@ static tcb_t *cur_task = NULL;
#ifdef DO_TASK_METRICS
static uint32_t tick_start = 0;
-static uint32_t tick_prev = 0;
static uint32_t tick_idle = 0;
static uint32_t tick_max = 0;
static uint32_t nyield = 0;
#endif
+static uint32_t tick_prev = 0;
+#ifndef TASK_YIELD_THRESHOLD
+#define TASK_YIELD_THRESHOLD 100
+#endif
+
/* Add a task.
*/
tcb_t *task_add(char *name, funcp_t func, void *cookie, void *stack, size_t stack_len)
@@ -221,6 +225,8 @@ void task_yield(void)
}
tick_prev = tick;
++nyield;
+#else
+ tick_prev = HAL_GetTick();
#endif
/* If there are no other runnable tasks (and cur_task is runnable),
@@ -256,6 +262,14 @@ void task_yield(void)
}
}
+/* Yield if it's been "too long" since the last yield.
+ */
+void task_yield_maybe(void)
+{
+ if (HAL_GetTick() - tick_prev >= TASK_YIELD_THRESHOLD)
+ task_yield();
+}
+
/* Put the current task to sleep (make it non-runnable).
*/
void task_sleep(void)
diff --git a/task.h b/task.h
index de3e275..47d62d6 100644
--- a/task.h
+++ b/task.h
@@ -55,6 +55,7 @@ extern tcb_t *task_add(char *name, funcp_t func, void *cookie, void *stack, size
extern void task_set_idle_hook(funcp_t func);
extern void task_yield(void);
+extern void task_yield_maybe(void);
extern void task_sleep(void);
extern void task_wake(tcb_t *t);