acadia/zion/syscall/thread.cpp

#include "syscall/thread.h"

#include "capability/capability.h"
#include "debug/debug.h"
#include "scheduler/scheduler.h"

glcr::ErrorCode ThreadCreate(ZThreadCreateReq* req) {
  auto& curr_proc = gScheduler->CurrentProcess();
  auto cap = curr_proc.GetCapability(req->proc_cap);
  RET_ERR(ValidateCapability<Process>(cap, ZC_PROC_SPAWN_THREAD));

  auto parent_proc = cap->obj<Process>();
  auto thread = parent_proc->CreateThread();
  *req->thread_cap = curr_proc.AddNewCapability(thread, ZC_WRITE | ZC_READ);
  return glcr::OK;
}

glcr::ErrorCode ThreadStart(ZThreadStartReq* req) {
  auto& curr_proc = gScheduler->CurrentProcess();
  auto cap = curr_proc.GetCapability(req->thread_cap);
  RET_ERR(ValidateCapability<Thread>(cap, ZC_WRITE));

  auto thread = cap->obj<Thread>();
  // FIXME: validate entry point is in user space.
  thread->Start(req->entry, req->arg1, req->arg2);
  return glcr::OK;
}

glcr::ErrorCode ThreadExit(ZThreadExitReq*) {
  auto curr_thread = gScheduler->CurrentThread();
  curr_thread->Exit();
  panic("Returned from thread exit");
  UNREACHABLE
}

glcr::ErrorCode ThreadWait(ZThreadWaitReq* req) {
  auto& curr_proc = gScheduler->CurrentProcess();
  auto cap = curr_proc.GetCapability(req->thread_cap);
  RET_ERR(ValidateCapability<Thread>(cap, ZC_READ));
  auto thread = cap->obj<Thread>();
  thread->Wait();
  return glcr::OK;
}