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Kernel: Guard the all processes list with a Spinlock rather than a Mutex

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There are callers of processes().with or processes().for_each that
require interrupts to be disabled. Taking a Mutexe with interrupts
disabled is a recipe for deadlock, so convert this to a Spinlock.
This commit is contained in:
Andrew Kaster 2021-08-22 21:53:26 -06:00 • committed by Andreas Kling
parent 70518e69f4
commit dea62fe93c
4 changed files with 13 additions and 13 deletions
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8
Kernel/Process.h
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@ -815,13 +815,13 @@ static_assert(sizeof(Process) == (PAGE_SIZE * 2));
extern RecursiveSpinlock g_profiling_lock;
MutexProtected<Process::List>& processes();
SpinlockProtected<Process::List>& processes();
template<IteratorFunction<Process&> Callback>
inline void Process::for_each(Callback callback)
{
VERIFY_INTERRUPTS_DISABLED();
processes().with_shared([&](const auto& list) {
processes().with([&](const auto& list) {
for (auto it = list.begin(); it != list.end();) {
auto& process = *it;
++it;
@ -835,7 +835,7 @@ template<IteratorFunction<Process&> Callback>
inline void Process::for_each_child(Callback callback)
{
ProcessID my_pid = pid();
processes().with_shared([&](const auto& list) {
processes().with([&](const auto& list) {
for (auto it = list.begin(); it != list.end();) {
auto& process = *it;
++it;
@ -876,7 +876,7 @@ inline IterationDecision Process::for_each_thread(Callback callback)
template<IteratorFunction<Process&> Callback>
inline void Process::for_each_in_pgrp(ProcessGroupID pgid, Callback callback)
{
processes().with_shared([&](const auto& list) {
processes().with([&](const auto& list) {
for (auto it = list.begin(); it != list.end();) {
auto& process = *it;
++it;