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kernel: preserve guest pthread priorities

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Extracted from Stefanos Costa's pthread fix in #147.
This commit is contained in:
Stefanos Costa
2026-08-03 01:10:38 +02:00
committed by nmzik
parent 86a586025f
commit 1a164c3628
1 changed files with 36 additions and 47 deletions
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src/kernel/pthread.cpp
+36 -47
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@@ -365,6 +365,7 @@ struct PthreadAttrPrivate {
uint64_t stack_map_addr;
size_t stack_map_size;
int policy;
int guest_priority;
int inherit_sched;
int solosched;
bool detached;
@@ -2128,13 +2129,8 @@ int KYTY_SYSV_ABI PthreadAttrGetschedparam(const PthreadAttr* attr, KernelSchedP
int result = pthread_attr_getschedparam(&(*attr)->p, param);
if (param->sched_priority <= -2) {
param->sched_priority = 767;
} else if (param->sched_priority >= +2) {
param->sched_priority = 256;
} else {
param->sched_priority = 700;
}
// Host priority mapping is lossy; return the exact guest value.
param->sched_priority = (*attr)->guest_priority;
if (result == 0) {
return OK;
@@ -2298,6 +2294,7 @@ int KYTY_SYSV_ABI PthreadAttrSetschedparam(PthreadAttr* attr, const KernelSchedP
return KERNEL_ERROR_EINVAL;
}
#if KYTY_PLATFORM == KYTY_PLATFORM_WINDOWS
KernelSchedParam pparam {};
if (param->sched_priority <= 478) {
pparam.sched_priority = +2;
@@ -2307,12 +2304,13 @@ int KYTY_SYSV_ABI PthreadAttrSetschedparam(PthreadAttr* attr, const KernelSchedP
pparam.sched_priority = 0;
}
int result = pthread_attr_setschedparam(&attr_value->p, &pparam);
if (result == 0) {
return OK;
if (pthread_attr_setschedparam(&attr_value->p, &pparam) != 0) {
return KERNEL_ERROR_EINVAL;
}
return KERNEL_ERROR_EINVAL;
#endif
attr_value->guest_priority = param->sched_priority;
return OK;
}
int KYTY_SYSV_ABI PthreadAttrSetschedpolicy(PthreadAttr* attr, int policy) {
@@ -3639,26 +3637,15 @@ int KYTY_SYSV_ABI PthreadGetprio(Pthread thread, int* prio) {
EXIT_NOT_IMPLEMENTED(prio == nullptr);
sched_param param {};
int pol = 0;
int result = pthread_getschedparam(thread->p, &pol, &param);
if (result == 0) {
if (param.sched_priority <= -2) {
*prio = 767;
} else if (param.sched_priority >= +2) {
*prio = 256;
} else {
*prio = 700;
}
LOGF("\t PthreadGetprio: %d, %d\n", thread->unique_id, *prio);
return OK;
sched_param native_param {};
int native_policy = 0;
if (pthread_getschedparam(thread->p, &native_policy, &native_param) != 0) {
return KERNEL_ERROR_EINVAL;
}
return KERNEL_ERROR_EINVAL;
*prio = thread->attr->guest_priority;
LOGF("\t PthreadGetprio: %d, %d\n", thread->unique_id, *prio);
return OK;
}
int KYTY_SYSV_ABI PthreadSetprio(Pthread thread, int prio) {
@@ -3673,25 +3660,27 @@ int KYTY_SYSV_ABI PthreadSetprio(Pthread thread, int prio) {
int result = pthread_getschedparam(thread->p, &pol, &param);
if (result == 0) {
if (prio <= 478) {
param.sched_priority = +2;
} else if (prio >= 733) {
param.sched_priority = -2;
} else {
param.sched_priority = 0;
}
result = pthread_setschedparam(thread->p, pol, &param);
if (result == 0) {
LOGF("\t PthreadSetprio: %d, %d\n", thread->unique_id, prio);
return OK;
}
if (result != 0) {
return KERNEL_ERROR_EINVAL;
}
return KERNEL_ERROR_EINVAL;
#if KYTY_PLATFORM == KYTY_PLATFORM_WINDOWS
if (prio <= 478) {
param.sched_priority = +2;
} else if (prio >= 733) {
param.sched_priority = -2;
} else {
param.sched_priority = 0;
}
if (pthread_setschedparam(thread->p, pol, &param) != 0) {
return KERNEL_ERROR_EINVAL;
}
#endif
thread->attr->guest_priority = prio;
LOGF("\t PthreadSetprio: %d, %d\n", thread->unique_id, prio);
return OK;
}
void KYTY_SYSV_ABI PthreadTestcancel() {