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| author | Bruno Haible <bruno@clisp.org> | 2018-06-18 18:16:34 +0200 |
|---|---|---|
| committer | Bruno Haible <bruno@clisp.org> | 2018-06-18 18:16:34 +0200 |
| commit | 8584beae8e0f4ac4a5c128d35da43241761501db (patch) | |
| tree | 64c722e63d43cbc34609384ef900adcf9bfcc31c /doc/posix-functions | |
| parent | 0d45ec7c033c165ad73a6509c7fa84aa67edf4ea (diff) | |
| download | gnulib-8584beae8e0f4ac4a5c128d35da43241761501db.tar.gz | |
pthread_rwlock_rdlock: Add comments regarding glibc behaviour.
* m4/pthread_rwlock_rdlock.m4: Add comment.
* doc/posix-functions/pthread_rwlock_rdlock.texi: Mention that rwlocks
are reader-preferring in glibc.
* doc/posix-functions/pthread_rwlock_tryrdlock.texi: Likwise.
* doc/posix-functions/pthread_rwlock_timedrdlock.texi: Likewise.
Diffstat (limited to 'doc/posix-functions')
| -rw-r--r-- | doc/posix-functions/pthread_rwlock_rdlock.texi | 9 | ||||
| -rw-r--r-- | doc/posix-functions/pthread_rwlock_timedrdlock.texi | 7 | ||||
| -rw-r--r-- | doc/posix-functions/pthread_rwlock_tryrdlock.texi | 7 |
3 files changed, 23 insertions, 0 deletions
diff --git a/doc/posix-functions/pthread_rwlock_rdlock.texi b/doc/posix-functions/pthread_rwlock_rdlock.texi index 3759f782e1..387dabed77 100644 --- a/doc/posix-functions/pthread_rwlock_rdlock.texi +++ b/doc/posix-functions/pthread_rwlock_rdlock.texi @@ -15,4 +15,13 @@ Portability problems not fixed by Gnulib: @item This function is missing on some platforms: Minix 3.1.8, HP-UX 11, OSF/1 4.0, Solaris 2.6, mingw, MSVC 14, BeOS. +@item +This function prefers readers to writers (meaning, when this function is +called on an rwlock that is already taken by one or more readers, and +another writer is already waiting to take it, this function may return +successfully immediately) -- a behaviour that may lead to writer starvation -- +on some platforms: +glibc 2.28. +As a workaround, you can use the @code(gl_rwlock_t} type from the Gnulib +module @samp{lock}. @end itemize diff --git a/doc/posix-functions/pthread_rwlock_timedrdlock.texi b/doc/posix-functions/pthread_rwlock_timedrdlock.texi index 07194c1387..52cc74a789 100644 --- a/doc/posix-functions/pthread_rwlock_timedrdlock.texi +++ b/doc/posix-functions/pthread_rwlock_timedrdlock.texi @@ -15,4 +15,11 @@ Portability problems not fixed by Gnulib: @item This function is missing on some platforms: Mac OS X 10.5, FreeBSD 5.2.1, OpenBSD 3.8, Minix 3.1.8, AIX 5.1, HP-UX 11, IRIX 6.5, OSF/1 5.1, Solaris 9, Cygwin, mingw, MSVC 14, BeOS. +@item +This function prefers readers to writers (meaning, when this function is +called on an rwlock that is already taken by one or more readers, and +another writer is already waiting to take it, this function may return +successfully immediately) -- a behaviour that may lead to writer starvation -- +on some platforms: +glibc 2.28. @end itemize diff --git a/doc/posix-functions/pthread_rwlock_tryrdlock.texi b/doc/posix-functions/pthread_rwlock_tryrdlock.texi index 370a899aae..b817212e97 100644 --- a/doc/posix-functions/pthread_rwlock_tryrdlock.texi +++ b/doc/posix-functions/pthread_rwlock_tryrdlock.texi @@ -15,4 +15,11 @@ Portability problems not fixed by Gnulib: @item This function is missing on some platforms: Minix 3.1.8, HP-UX 11, OSF/1 4.0, Solaris 2.6, mingw, MSVC 14, BeOS. +@item +This function prefers readers to writers (meaning, when this function is +called on an rwlock that is already taken by one or more readers, and +another writer is already waiting to take it, this function may return +successfully immediately) -- a behaviour that may lead to writer starvation -- +on some platforms: +glibc 2.28. @end itemize |