int Message::receive(MessageInfo* info)
{
int result = syscall_receive(info);
if (result != M_OK)
{
syscall_mthread_yield_message();
result = syscall_receive(info);
}
return result;
}
PUBLIC void syscall_handle(void)
{
struct proc* target_proc;
pid_t pid;
u32_t syscall_num;
u8_t res;
arch_printf("syscall_handle\n");
struct thread* th = cur_th;
/* Get current thread */
if (th == NULL)
{
res = IPC_FAILURE;
goto end;
}
/* Get syscall number from source register */
syscall_num = arch_ctx_get((arch_ctx_t*)th, ARCH_CONST_SOURCE);
/* Put originator proc into source register instead */
arch_ctx_set((arch_ctx_t*)th, ARCH_CONST_SOURCE,th->proc->pid);
/* Destination proc, stored in EDI */
pid = (pid_t)arch_ctx_get((arch_ctx_t*)th, ARCH_CONST_DEST);
if ( pid == IPC_ANY)
{
target_proc = NULL;
}
else
{
/* Get proc structure from given id */
target_proc = proc_pid(pid);
if ( target_proc == NULL )
{
res = IPC_FAILURE;
goto end;
}
}
/* Dispatch call to effective primitives */
switch(syscall_num)
{
case SYSCALL_SEND:
{
res = syscall_send(th, target_proc);
break;
}
case SYSCALL_RECEIVE:
{
res = syscall_receive(th, target_proc);
break;
}
case SYSCALL_NOTIFY:
{
res = syscall_notify(th, target_proc);
break;
}
default:
{
arch_printf("not a syscall number\n");
res = IPC_FAILURE;
break;
}
}
end:
/* Set result in caller's return register */
arch_ctx_set((arch_ctx_t*)th, ARCH_CONST_RETURN,res);
arch_printf("end of syscall :%u\n",arch_ctx_get((arch_ctx_t*)th, ARCH_CONST_RETURN));
return;
}