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Let reap() communicate the dead process's exit status to the caller.

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This way the scheduler doesn't need to plumb the exit status into the waiter.
We still plumb the waitee pid though, I don't love it but it can be fixed.
This commit is contained in:
Andreas Kling 2018-11-28 22:01:24 +01:00
parent 938d1b8bfb
commit d90104f9e0
Notes: sideshowbarker 2024-07-19 16:09:33 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/d90104f9e00
4 changed files with 18 additions and 14 deletions
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2
AK/Compiler.h
View file

@ -7,4 +7,4 @@
#define NEVER_INLINE __attribute__ ((noinline))
#define MALLOC_ATTR __attribute__ ((malloc))
#define PURE __attribute__ ((pure))
#define WARN_UNUSED_RESULT __attribute__ ((warn_unused_result))

18
Kernel/Process.cpp
View file

@ -1411,13 +1411,15 @@ mode_t Process::sys$umask(mode_t mask)
return old_mask;
}
void Process::reap(Process& process)
int Process::reap(Process& process)
{
InterruptDisabler disabler;
int exit_status = (process.m_termination_status << 8) | process.m_termination_signal;
dbgprintf("reap: %s(%u) {%s}\n", process.name().characters(), process.pid(), toString(process.state()));
ASSERT(process.state() == Dead);
g_processes->remove(&process);
delete &process;
return exit_status;
}
pid_t Process::sys$waitpid(pid_t waitee, int* wstatus, int options)
@ -1429,6 +1431,9 @@ pid_t Process::sys$waitpid(pid_t waitee, int* wstatus, int options)
if (!validate_write_typed(wstatus))
return -EFAULT;
int dummy_wstatus;
int& exit_status = wstatus ? *wstatus : dummy_wstatus;
{
InterruptDisabler disabler;
if (waitee != -1 && !Process::from_pid(waitee))
@ -1439,10 +1444,10 @@ pid_t Process::sys$waitpid(pid_t waitee, int* wstatus, int options)
if (waitee == -1) {
pid_t reaped_pid = 0;
InterruptDisabler disabler;
for_each_child([&reaped_pid] (Process& process) {
for_each_child([&reaped_pid, &exit_status] (Process& process) {
if (process.state() == Dead) {
reaped_pid = process.pid();
reap(process);
exit_status = reap(process);
}
return true;
});
@ -1452,7 +1457,7 @@ pid_t Process::sys$waitpid(pid_t waitee, int* wstatus, int options)
if (!waitee_process)
return -ECHILD;
if (waitee_process->state() == Dead) {
reap(*waitee_process);
exit_status = reap(*waitee_process);
return waitee;
}
return 0;
@ -1460,7 +1465,6 @@ pid_t Process::sys$waitpid(pid_t waitee, int* wstatus, int options)
}
m_waitee = waitee;
m_waitee_status = 0;
block(BlockedWait);
sched_yield();
if (m_was_interrupted_while_blocked)
@ -1473,9 +1477,7 @@ pid_t Process::sys$waitpid(pid_t waitee, int* wstatus, int options)
waitee_process = Process::from_pid(m_waitee);
}
ASSERT(waitee_process);
reap(*waitee_process);
if (wstatus)
*wstatus = m_waitee_status;
exit_status = reap(*waitee_process);
return m_waitee;
}

3
Kernel/Process.h
View file

@ -177,7 +177,7 @@ public:
static void initialize();
void crash() NORETURN;
static void reap(Process&);
static int reap(Process&) WARN_UNUSED_RESULT;
const TTY* tty() const { return m_tty; }
@ -267,7 +267,6 @@ private:
void* m_kernelStack { nullptr };
dword m_timesScheduled { 0 };
pid_t m_waitee { -1 };
int m_waitee_status { 0 };
int m_fdBlockedOnRead { -1 };
int m_blocked_fd { -1 };
size_t m_max_open_file_descriptors { 16 };

9
Kernel/Scheduler.cpp
View file

@ -39,7 +39,6 @@ bool Scheduler::pick_next()
if (child.state() != Process::Dead)
return true;
if (process.waitee() == -1 || process.waitee() == child.pid()) {
process.m_waitee_status = (child.m_termination_status << 8) | child.m_termination_signal;
process.m_waitee = child.pid();
process.unblock();
return false;
@ -75,8 +74,12 @@ bool Scheduler::pick_next()
}
if (process.state() == Process::Dead) {
if (current != &process && !Process::from_pid(process.ppid()))
Process::reap(process);
if (current != &process && !Process::from_pid(process.ppid())) {
auto name = process.name();
auto pid = process.pid();
auto exit_status = Process::reap(process);
kprintf("reaped unparented process %s(%u), exit status: %u\n", name.characters(), pid, exit_status);
}
return true;
}