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Kernel: Switch process file descriptor table from spinlock to mutex

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There's no reason for this to use a spinlock. Instead, let's allow
threads to block if someone else is using the descriptor table.
This commit is contained in:
Andreas Kling 2022-01-29 01:29:07 +01:00
parent 8ebec2938c
commit b56646e293
Notes: sideshowbarker 2024-07-17 20:03:36 +09:00
16 changed files with 37 additions and 37 deletions
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6
Kernel/Syscalls/pipe.cpp
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@ -13,7 +13,7 @@ ErrorOr<FlatPtr> Process::sys$pipe(int pipefd[2], int flags)
{
VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
TRY(require_promise(Pledge::stdio));
auto open_count = fds().with([](auto& fds) { return fds.open_count(); });
auto open_count = fds().with_shared([](auto& fds) { return fds.open_count(); });
if (open_count + 2 > OpenFileDescriptions::max_open())
return EMFILE;
// Reject flags other than O_CLOEXEC, O_NONBLOCK
@ -26,7 +26,7 @@ ErrorOr<FlatPtr> Process::sys$pipe(int pipefd[2], int flags)
ScopedDescriptionAllocation reader_fd_allocation;
ScopedDescriptionAllocation writer_fd_allocation;
TRY(m_fds.with([&](auto& fds) -> ErrorOr<void> {
TRY(m_fds.with_exclusive([&](auto& fds) -> ErrorOr<void> {
reader_fd_allocation = TRY(fds.allocate());
writer_fd_allocation = TRY(fds.allocate());
return {};
@ -42,7 +42,7 @@ ErrorOr<FlatPtr> Process::sys$pipe(int pipefd[2], int flags)
writer_description->set_blocking(false);
}
TRY(m_fds.with([&](auto& fds) -> ErrorOr<void> {
TRY(m_fds.with_exclusive([&](auto& fds) -> ErrorOr<void> {
fds[reader_fd_allocation.fd].set(move(reader_description), fd_flags);
fds[writer_fd_allocation.fd].set(move(writer_description), fd_flags);
return {};