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deadlock broken by taking the lower index dongle first; no monitor and scheduling yet

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This commit is contained in:
Semere M. Mebrahtom 2026-03-26 09:25:48 +01:00
parent 13019ac0bc
commit 7748a53eb2
Signed by: semere
GPG key ID: 7FC937214DF30488
2 changed files with 58 additions and 39 deletions
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31
coders/main.c
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@ -27,16 +27,27 @@ long now(void)
void compile_op(t_coder *coder, t_state *state)
{
// acquire right dongle
pthread_mutex_lock(&coder->left_dongle->lock);
coder->left_dongle->last_used = now();
t_dongle *first, *second;
if (coder->right_dongle->index < coder->left_dongle->index)
{
first = coder->left_dongle;
second = coder->right_dongle;
}
else
{
first = coder->right_dongle;
second = coder->left_dongle;
}
// acquire first dongle
pthread_mutex_lock(&first->lock);
first->last_used = now();
pthread_mutex_lock(&state->print_mutex);
printf("%ld %d has taken a dongle\n", now() - state->start,
coder->coder_id);
pthread_mutex_unlock(&state->print_mutex);
// acquire right dongle
pthread_mutex_lock(&coder->right_dongle->lock);
coder->right_dongle->last_used = now();
// acquire second dongle
pthread_mutex_lock(&second->lock);
second->last_used = now();
pthread_mutex_lock(&state->print_mutex);
printf("%ld %d has taken a dongle\n", now() - state->start,
coder->coder_id);
@ -46,8 +57,9 @@ void compile_op(t_coder *coder, t_state *state)
printf("%ld %d is compiling\n", now() - state->start, coder->coder_id);
pthread_mutex_unlock(&state->print_mutex);
usleep(state->args.time_to_compile * 1000L);
pthread_mutex_unlock(&coder->left_dongle->lock);
pthread_mutex_unlock(&coder->right_dongle->lock);
// release dongles
pthread_mutex_unlock(&first->lock);
pthread_mutex_unlock(&second->lock);
coder->compiles_done += 1;
}
@ -74,7 +86,7 @@ void *run(void *param)
int i;
coder = param;
state = (t_state *)(coder->state);
state = coder->state;
i = 0;
while (i < state->args.number_of_compiles_required)
{
@ -128,6 +140,7 @@ int main(int argc, char **argv)
i = 0;
while (i < args->number_of_coders)
{
dongles[i].index = i;
pthread_mutex_init(&dongles[i].lock, NULL);
dongles[i].last_used = state.start - args->dongle_cooldown;
i++;