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[Zion] Add a semaphore primitive with related syscalls.

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This commit is contained in:
Drew Galbraith 2023-11-22 10:19:56 -08:00
parent 2df1f6c006
commit da3901e104
9 changed files with 107 additions and 1 deletions
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28
zion/syscall/synchronization.cpp
View file

@ -1,6 +1,7 @@
#include "syscall/synchronization.h"
#include "object/mutex.h"
#include "object/semaphore.h"
#include "scheduler/scheduler.h"
glcr::ErrorCode MutexCreate(ZMutexCreateReq* req) {
@ -22,10 +23,35 @@ glcr::ErrorCode MutexLock(ZMutexLockReq* req) {
glcr::ErrorCode MutexRelease(ZMutexReleaseReq* req) {
auto& curr_proc = gScheduler->CurrentProcess();
auto cap = curr_proc.GetCapability(req->mutex_cap);
// TODO: We may not want a separate permission for releasing the mutex.
RET_ERR(ValidateCapability<Mutex>(cap, kZionPerm_Release));
auto mutex = cap->obj<Mutex>();
mutex->Release();
return glcr::OK;
}
glcr::ErrorCode SemaphoreCreate(ZSemaphoreCreateReq* req) {
auto& curr_proc = gScheduler->CurrentProcess();
*req->semaphore_cap = curr_proc.AddNewCapability(Semaphore::Create());
return glcr::OK;
}
glcr::ErrorCode SemaphoreWait(ZSemaphoreWaitReq* req) {
auto& curr_proc = gScheduler->CurrentProcess();
auto cap = curr_proc.GetCapability(req->semaphore_cap);
RET_ERR(ValidateCapability<Semaphore>(cap, kZionPerm_Wait));
auto semaphore = cap->obj<Semaphore>();
semaphore->Wait();
return glcr::OK;
}
glcr::ErrorCode SemaphoreSignal(ZSemaphoreSignalReq* req) {
auto& curr_proc = gScheduler->CurrentProcess();
auto cap = curr_proc.GetCapability(req->semaphore_cap);
RET_ERR(ValidateCapability<Semaphore>(cap, kZionPerm_Signal));
auto semaphore = cap->obj<Semaphore>();
semaphore->Signal();
return glcr::OK;
}

4
zion/syscall/synchronization.h
View file

@ -7,3 +7,7 @@
glcr::ErrorCode MutexCreate(ZMutexCreateReq* req);
glcr::ErrorCode MutexLock(ZMutexLockReq* req);
glcr::ErrorCode MutexRelease(ZMutexReleaseReq* req);
glcr::ErrorCode SemaphoreCreate(ZSemaphoreCreateReq* req);
glcr::ErrorCode SemaphoreWait(ZSemaphoreWaitReq* req);
glcr::ErrorCode SemaphoreSignal(ZSemaphoreSignalReq* req);

3
zion/syscall/syscall.cpp
View file

@ -88,6 +88,9 @@ extern "C" z_err_t SyscallHandler(uint64_t call_id, void* req) {
CASE(MutexCreate);
CASE(MutexLock);
CASE(MutexRelease);
CASE(SemaphoreCreate);
CASE(SemaphoreWait);
CASE(SemaphoreSignal);
// syscall/debug.h
CASE(Debug);
default: