Make waiting_fd behaviour per-IO.
#13127
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Pull Request Overview
This PR refactors the “waiting_fd” behavior so that waiting and blocking operations are managed per‑IO rather than via a global list. Key changes include:
- Removing the global waiting_fd list initialization and associated memory‐size functions (e.g. in vm_core.h and vm.c).
- Replacing the waiting_fd structure and its helper functions in thread.c with per‑IO blocking operation nodes.
- Eliminating the thread_fd close test file, consistent with the new per‑IO design.
Reviewed Changes
Copilot reviewed 12 out of 13 changed files in this pull request and generated 1 comment.
Show a summary per file
| File | Description |
|---|---|
| vm_core.h | Removed initialization of the global waiting_fds list. |
| vm.c | Removed calls to rb_vm_memsize_waiting_fds in memory size reporting. |
| thread.c | Commented out and removed waiting_fd structures/functions in favor of per‑IO nodes. |
| test/-ext-/thread_fd/test_thread_fd_close.rb | Removed outdated test file no longer applicable under the new design. |
| io.c | Updated blocking call APIs to accept an IO pointer instead of a raw file descriptor. |
| internal/* | Updated function declarations and struct fields to reflect per‑IO blocking operations. |
Files not reviewed (1)
- ext/-test-/thread_fd/depend: Language not supported
Comments suppressed due to low confidence (2)
vm.c:3229
- Verify that the new per‑IO blocking operations are correctly accounted for in the overall memory size calculations now that the global waiting_fd memory size contribution has been removed.
- rb_vm_memsize_waiting_fds(&vm->waiting_fds) +
test/-ext-/thread_fd/test_thread_fd_close.rb:1
- The removal of the thread_fd close test file reduces test coverage for FD closing behavior; please ensure that the per‑IO waiting/blocking operations introduced in this PR are adequately covered by other tests.
Entire file removed
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There was a problem hiding this comment.
Pull Request Overview
This PR refactors the Ruby VM’s waiting_fd behavior to operate on a per-IO basis. In doing so, the global waiting_fds list and its associated functions have been removed and replaced with per-IO blocking operations.
- Remove waiting_fds initialization and memory size calculations in vm_core.h and vm.c.
- Replace waiting_fd struct and functions in thread.c with a per-IO blocking_operations mechanism.
- Update test cases and IO-related functions (in io.c, internal/io.h, etc.) to reflect the new behavior.
Reviewed Changes
Copilot reviewed 11 out of 13 changed files in this pull request and generated no comments.
Show a summary per file
| File | Description |
|---|---|
| vm_core.h, vm.c | Removed waiting_fds handling and its memory reporting |
| thread.c | Deleted waiting_fd struct and functions; introduced blocking_operations |
| test/ruby/test_io.rb | Adjusted file descriptor range to match expected fd limits |
| io.c, internal/io.h | Updated IO structure and related functions to support blocking_operations |
| internal/thread.h, gc.c | Revised internal interfaces, GC marking, and thread IO close functionality |
| ext/-test-/thread_fd/* | Removed redundant test extensions |
Files not reviewed (2)
- common.mk: Language not supported
- ext/-test-/thread_fd/depend: Language not supported
Comments suppressed due to low confidence (3)
test/ruby/test_io.rb:3829
- [nitpick] The adjustment of the range from (0..fd_setsize+1) to (0...fd_setsize) should be reviewed to ensure the test still covers the intended boundary conditions for file descriptor limits.
(0...fd_setsize).map {|i|
thread.c:1709
- With the removal of the waiting_fd mechanism and the introduction of rb_mutex_synchronize in io_blocking_operation_release, please verify that this change does not introduce any race conditions during unblocking.
rb_fiber_scheduler_unblock(thread->scheduler, io->self, rb_fiberptr_self(fiber));
io.c:5688
- [nitpick] The inclusion of the blocking_operations list in the memory size calculation is appropriate; please confirm that any future additions to the rb_io structure are also reflected in this computation to avoid memory under-reporting.
size += io->rbuf.capa;
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See #5384 for full context.