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Redesign scheduling points
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This commit is contained in:
Kamil Kowalczyk
2026-01-30 02:36:27 +01:00
parent d2f5c032d9
commit 124aa12f5b
9 changed files with 60 additions and 35 deletions
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16
init/init.c
View File

@@ -24,12 +24,28 @@ void app_proc1 (void) {
process_quit ();
}
void app_proc2 (void) {
letter = 'd';
for (;;) {
mutex_lock (MUTEX);
for (int i = 0; i < 3; i++)
test (letter);
mutex_unlock (MUTEX);
}
process_quit ();
}
void app_main (void) {
mutex_create (MUTEX);
letter = 'a';
process_spawn (&app_proc1);
process_spawn (&app_proc2);
for (;;) {
mutex_lock (MUTEX);

36
kernel/proc/mutex.c
View File

@@ -44,13 +44,15 @@ void proc_mutexes_cleanup (struct proc* proc) {
spin_unlock (&proc->procgroup->lock, &ctxpg);
}
void proc_cleanup_resource_mutex (struct proc_resource* resource) {
bool proc_cleanup_resource_mutex (struct proc_resource* resource) {
struct proc_mutex* mutex = &resource->u.mutex;
spin_lock_ctx_t ctxmt, ctxsq;
spin_lock (&mutex->resource->lock, &ctxmt);
spin_lock (&mutex->suspension_q.lock, &ctxsq);
bool reschedule = PROC_NO_RESCHEDULE;
while (mutex->suspension_q.proc_list != NULL) {
struct list_node_link* node = mutex->suspension_q.proc_list;
struct proc_sq_entry* sq_entry = list_entry (node, struct proc_sq_entry, sq_link);
@@ -60,7 +62,7 @@ void proc_cleanup_resource_mutex (struct proc_resource* resource) {
spin_unlock (&mutex->suspension_q.lock, &ctxsq);
spin_unlock (&mutex->resource->lock, &ctxmt);
proc_sq_resume (suspended_proc, sq_entry);
reschedule = reschedule || proc_sq_resume (suspended_proc, sq_entry);
/* reacquire */
spin_lock (&mutex->resource->lock, &ctxmt);
@@ -72,23 +74,23 @@ void proc_cleanup_resource_mutex (struct proc_resource* resource) {
spin_unlock (&mutex->suspension_q.lock, &ctxsq);
spin_unlock (&mutex->resource->lock, &ctxmt);
return reschedule;
}
void proc_mutex_lock (struct proc* proc, struct proc_mutex* mutex) {
bool proc_mutex_lock (struct proc* proc, struct proc_mutex* mutex) {
spin_lock_ctx_t ctxmt;
for (;;) {
spin_lock (&mutex->resource->lock, &ctxmt);
spin_lock (&mutex->resource->lock, &ctxmt);
if (!mutex->locked || mutex->owner == proc) {
mutex->locked = true;
mutex->owner = proc;
spin_unlock (&mutex->resource->lock, &ctxmt);
return;
}
proc_sq_suspend (proc, &mutex->suspension_q, &mutex->resource->lock, &ctxmt);
if (!mutex->locked || mutex->owner == proc) {
mutex->locked = true;
mutex->owner = proc;
spin_unlock (&mutex->resource->lock, &ctxmt);
return PROC_NO_RESCHEDULE;
}
return proc_sq_suspend (proc, &mutex->suspension_q, &mutex->resource->lock, &ctxmt);
}
bool proc_mutex_unlock (struct proc* proc, struct proc_mutex* mutex) {
@@ -98,7 +100,7 @@ bool proc_mutex_unlock (struct proc* proc, struct proc_mutex* mutex) {
if (mutex->owner != proc) {
spin_unlock (&mutex->resource->lock, &ctxmt);
return false;
return PROC_NO_RESCHEDULE;
}
spin_lock (&mutex->suspension_q.lock, &ctxsq);
@@ -115,9 +117,7 @@ bool proc_mutex_unlock (struct proc* proc, struct proc_mutex* mutex) {
spin_unlock (&mutex->suspension_q.lock, &ctxsq);
spin_unlock (&mutex->resource->lock, &ctxmt);
proc_sq_resume (resumed_proc, sq_entry);
return true;
return proc_sq_resume (resumed_proc, sq_entry);
}
mutex->locked = false;
@@ -126,5 +126,5 @@ bool proc_mutex_unlock (struct proc* proc, struct proc_mutex* mutex) {
spin_unlock (&mutex->suspension_q.lock, &ctxsq);
spin_unlock (&mutex->resource->lock, &ctxmt);
return true;
return PROC_NEED_RESCHEDULE;
}

4
kernel/proc/mutex.h
View File

@@ -15,8 +15,8 @@ struct proc_mutex {
struct proc* owner;
};
void proc_cleanup_resource_mutex (struct proc_resource* resource);
void proc_mutex_lock (struct proc* proc, struct proc_mutex* mutex);
bool proc_cleanup_resource_mutex (struct proc_resource* resource);
bool proc_mutex_lock (struct proc* proc, struct proc_mutex* mutex);
bool proc_mutex_unlock (struct proc* proc, struct proc_mutex* mutex);
void proc_mutexes_cleanup (struct proc* proc);

3
kernel/proc/proc.h
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@@ -17,6 +17,9 @@
#include <amd64/proc.h> /* USTACK_SIZE */
#endif
#define PROC_NEED_RESCHEDULE true
#define PROC_NO_RESCHEDULE false
/* process states */
#define PROC_READY 0
#define PROC_DEAD 1

6
kernel/proc/resource.c
View File

@@ -51,7 +51,9 @@ struct proc_resource* proc_create_resource_mutex (struct procgroup* procgroup, i
return resource;
}
void proc_delete_resource (struct proc_resource* resource) {
resource->ops.cleanup (resource);
bool proc_delete_resource (struct proc_resource* resource) {
bool reschedule = resource->ops.cleanup (resource);
free (resource);
return reschedule;
}

4
kernel/proc/resource.h
View File

@@ -21,12 +21,12 @@ struct proc_resource {
struct proc_mutex mutex;
} u;
struct {
void (*cleanup) (struct proc_resource* resource);
bool (*cleanup) (struct proc_resource* resource);
} ops;
};
struct proc_resource* proc_find_resource (struct procgroup* procgroup, int rid);
struct proc_resource* proc_create_resource_mutex (struct procgroup* procgroup, int rid);
void proc_delete_resource (struct proc_resource* resource);
bool proc_delete_resource (struct proc_resource* resource);
#endif // _KERNEL_PROC_RESOURCE_H

10
kernel/proc/suspension_q.c
View File

@@ -8,7 +8,7 @@
#include <sys/smp.h>
#include <sys/spin_lock.h>
void proc_sq_suspend (struct proc* proc, struct proc_suspension_q* sq, spin_lock_t* resource_lock,
bool proc_sq_suspend (struct proc* proc, struct proc_suspension_q* sq, spin_lock_t* resource_lock,
spin_lock_ctx_t* ctxrl) {
spin_lock_ctx_t ctxpr, ctxcpu, ctxsq;
struct cpu* cpu = proc->cpu;
@@ -16,7 +16,7 @@ void proc_sq_suspend (struct proc* proc, struct proc_suspension_q* sq, spin_lock
struct proc_sq_entry* sq_entry = malloc (sizeof (*sq_entry));
if (!sq_entry) {
spin_unlock (resource_lock, ctxrl);
return;
return PROC_NO_RESCHEDULE;
}
sq_entry->proc = proc;
@@ -48,10 +48,10 @@ void proc_sq_suspend (struct proc* proc, struct proc_suspension_q* sq, spin_lock
spin_unlock (&proc->lock, &ctxpr);
spin_unlock (&cpu->lock, &ctxcpu);
cpu_request_sched (cpu);
return PROC_NEED_RESCHEDULE;
}
void proc_sq_resume (struct proc* proc, struct proc_sq_entry* sq_entry) {
bool proc_sq_resume (struct proc* proc, struct proc_sq_entry* sq_entry) {
spin_lock_ctx_t ctxsq, ctxpr, ctxcpu;
struct cpu* cpu = cpu_find_lightest ();
struct proc_suspension_q* sq = sq_entry->sq;
@@ -80,7 +80,7 @@ void proc_sq_resume (struct proc* proc, struct proc_sq_entry* sq_entry) {
free (sq_entry);
cpu_request_sched (cpu);
return PROC_NEED_RESCHEDULE;
}
void proc_sqs_cleanup (struct proc* proc) {

4
kernel/proc/suspension_q.h
View File

@@ -19,8 +19,8 @@ struct proc_sq_entry {
};
void proc_sqs_cleanup (struct proc* proc);
void proc_sq_suspend (struct proc* proc, struct proc_suspension_q* sq, spin_lock_t* resource_lock,
bool proc_sq_suspend (struct proc* proc, struct proc_suspension_q* sq, spin_lock_t* resource_lock,
spin_lock_ctx_t* ctxrl);
void proc_sq_resume (struct proc* proc, struct proc_sq_entry* sq_entry);
bool proc_sq_resume (struct proc* proc, struct proc_sq_entry* sq_entry);
#endif // _KERNEL_PROC_SUSPENTION_Q_H

12
kernel/syscall/syscall.c
View File

@@ -123,7 +123,8 @@ DEFINE_SYSCALL (sys_mutex_delete) {
if (mutex_resource == NULL)
return SYSRESULT (-ST_NOT_FOUND);
proc_delete_resource (mutex_resource);
if (proc_delete_resource (mutex_resource) == PROC_NEED_RESCHEDULE)
proc_sched ();
return SYSRESULT (ST_OK);
}
@@ -137,7 +138,8 @@ DEFINE_SYSCALL (sys_mutex_lock) {
if (mutex_resource == NULL)
return SYSRESULT (-ST_NOT_FOUND);
proc_mutex_lock (proc, &mutex_resource->u.mutex);
if (proc_mutex_lock (proc, &mutex_resource->u.mutex) == PROC_NEED_RESCHEDULE)
proc_sched ();
return SYSRESULT (ST_OK);
}
@@ -151,8 +153,10 @@ DEFINE_SYSCALL (sys_mutex_unlock) {
if (mutex_resource == NULL)
return SYSRESULT (-ST_NOT_FOUND);
return SYSRESULT (proc_mutex_unlock (proc, &mutex_resource->u.mutex) ? ST_OK
: -ST_PERMISSION_ERROR);
if (proc_mutex_unlock (proc, &mutex_resource->u.mutex) == PROC_NEED_RESCHEDULE)
proc_sched ();
return SYSRESULT (ST_OK);
}
static syscall_handler_func_t handler_table[] = {