Replacement for the usage pattern where people use uv_cpu_info() as an
imperfect heuristic for determining the amount of parallelism that is
available to their programs.
Fixes#3493.
- Add `Makefile` for example codes. (cherry-pick from old uvbook repo)
- Add a new example "Default loop" to "Basics of libuv"/"Default loop"
- Document review and update: `Introduction`, `Basics of libuv`, `Filesystem`
+ Update the referenced libuv code snippet
+ Link update: http->https
**Content Updates**:
- `filesystem.rst`#L291-L297: Add note for `uv_fs_event_start`
- `filesystem.rst`#L334: Add description of the callback function parameter `status`
The following examples have been tested manually in WSL2 (Ubuntu 20.04) with libuv 1.42.0:
- helloworld
- default-loop
- idle-basic
- uvcat
- uvtee
- onchange (test on macOS)
Co-authored-by: Nikhil Marathe <nsm.nikhil@gmail.com>
`uv_try_write2(stream, bufs, nbufs, send_handle)` acts like
`uv_try_write()` and extended write function for sending handles over a
pipe like `uv_write2`. It always returns `UV_EAGAIN` instead of
`UV_ENOSYS` on Windows so we can easily write cross-platform code
without special treatment.
PR-URL: https://github.com/libuv/libuv/pull/3183
Reviewed-By: Jameson Nash <vtjnash@gmail.com>
Implementation is based on RLIMIT_MEMLIMIT.
Co-authored-by: Igor Todorovski <itodorov@ca.ibm.com>
PR-URL: https://github.com/libuv/libuv/pull/3133
Reviewed-By: Richard Lau <rlau@redhat.com>
The Linux kernel suppresses some ICMP error messages by default for UDP
sockets. This commit sets IP_RECVERR/IPV6_RECVERR on the socket to
enable full ICMP error reporting, hopefully resulting in faster failover
to working name servers.
PR-URL: https://github.com/libuv/libuv/pull/2872
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
PR-URL: https://github.com/libuv/libuv/pull/3061
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
Equivalents of `pipe` and `socketpair` for cross-platform use.
PR-URL: https://github.com/libuv/libuv/pull/2953
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
The behavior of `uv_read_start()` when the handle is closing or already
busy reading wasn't consistent across platforms. Now it is.
Fixes: https://github.com/libuv/help/issues/137
PR-URL: https://github.com/libuv/libuv/pull/2795
Reviewed-By: Jameson Nash <vtjnash@gmail.com>
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Bartosz Sosnowski <bartosz@janeasystems.com>
Added notes to documentation of `uv_poll_t`:
- The callback will be called over-and-over again as long as the socket
remains readable/writable.
- uv_poll_stop() cancels pending callbacks of already happened events.
Fixes: https://github.com/libuv/libuv/issues/1078
PR-URL: https://github.com/libuv/libuv/pull/1100
Co-authored-by: Jameson Nash <vtjnash@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
It defers the error to uv_listen() or uv_tcp_connect().
PR-URL: https://github.com/libuv/libuv/pull/2218
Reviewed-By: Saúl Ibarra Corretgé <saghul@gmail.com>
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
Reviewed-By: Jameson Nash <vtjnash@gmail.com>
Store a copy of the original argv[0] to protect `uv_exepath()`
against `uv_set_process_title()` changing the value of argv[0].
Extract common code for finding a program on the current PATH.
Fixes: https://github.com/libuv/libuv/issues/2674
PR-URL: https://github.com/libuv/libuv/pull/2677
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Jameson Nash <vtjnash@gmail.com>
This commit updates uv_{get,set}_process_title() to return an
error when uv_setup_args() is needed, but has not been called.
Per-platform behavior after this commit:
- Windows: uv_setup_args() does nothing, get/set process title
works as before.
- Unix: get/set process title will return ENOBUFS if
uv_setup_args() wasn't called, if it failed, or if the process
title memory has been freed by uv__process_title_cleanup()
(via uv_library_shutdown()).
- AIX: set process title returns ENOBUFS if uv_setup_args()
wasn't called, if it failed to allocate memory for the argv
copy, or if the proctitle memory has been freed by
uv__process_title_cleanup() (via uv_library_shutdown).
Getting the process title will do the same except it can
still succeed if uv_setup_args() was called but failed to
allocate memory for the argv copy.
- BSD: uv_setup_args() is only needed for getting the initial
process title; if uv_setup_args() is not called then any
get_process_title calls() before a set_process_title() call
will return an empty string.
- Platforms that use no-proctitle.c: get will return an empty
string, set is a no-op (these are the same as before this commit)
Fixes: https://github.com/libuv/libuv/issues/2845
PR-URL: https://github.com/libuv/libuv/pull/2853
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Jameson Nash <vtjnash@gmail.com>
The API addition `uv_metrics_idle_time()` is a thread safe call that
allows the user to retrieve the amount of time the event loop has spent
in the kernel's event provider (i.e. poll). It was done this way to
allow retrieving this value without needing to interrupt the execution
of the event loop. This option can be enabled by passing
`UV_METRICS_IDLE_TIME` to `uv_loop_configure()`.
One important aspect of this change is, when enabled, to always first
call the event provider with a `timeout == 0`. This allows libuv to know
whether any events were waiting in the event queue when the event
provider was called. The importance of this is because libuv is tracking
the amount of "idle time", not "poll time". Thus the provider entry time
is not recorded when `timeout == 0` (the event provider never idles in
this case).
While this does add a small amount of overhead, when enabled, but the
overhead decreases when the event loop has a heavier load. This is
because poll events will be waiting when the event provider is called.
Thus never actually recording the provider entry time.
Checking if `uv_loop_t` is configured with `UV_METRICS_IDLE_TIME` always
happens in `uv__metrics_set_provider_entry_time()` and
`uv__metrics_update_idle_time()`. Making the conditional logic wrapping
each call simpler and allows for instrumentation to always hook into
those two function calls.
Rather than placing the fields directly on `uv__loop_internal_fields_t`
add the struct `uv__loop_metrics_t` as a location for future metrics API
additions.
Tests and additional documentation has been included.
PR-URL: https://github.com/libuv/libuv/pull/2725
Reviewed-By: Fedor Indutny <fedor.indutny@gmail.com>
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
Reviewed-By: Jameson Nash <vtjnash@gmail.com>
Allows for determining if a buffer large enough for multiple dgrams
should be allocated in alloc_cb of uv_udp_recvstart, for example.
Contributes towards #2822.
PR-URL: https://github.com/libuv/libuv/pull/2830
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Jameson Nash <vtjnash@gmail.com>
Exposes the original system error of the filesystem syscalls. Adds a new
uv_fs_get_system_error which returns orignal errno on Linux or
GetLastError on Windows.
Ref: https://github.com/libuv/libuv/issues/2348
PR-URL: https://github.com/libuv/libuv/pull/2810
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
Make the documentation reflect that the init/start/stop functions
for check/idle/prepare handles always succeed.
PR-URL: https://github.com/libuv/libuv/pull/2803
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
