diff options
Diffstat (limited to '')
| -rw-r--r-- | man3/flockfile.3 | 23 |
1 files changed, 11 insertions, 12 deletions
diff --git a/man3/flockfile.3 b/man3/flockfile.3 index c2a18a4..911f8de 100644 --- a/man3/flockfile.3 +++ b/man3/flockfile.3 @@ -3,7 +3,7 @@ .\" .\" SPDX-License-Identifier: Linux-man-pages-copyleft .\" -.TH flockfile 3 2023-07-20 "Linux man-pages 6.05.01" +.TH flockfile 3 2023-10-31 "Linux man-pages 6.7" .SH NAME flockfile, ftrylockfile, funlockfile \- lock FILE for stdio .SH LIBRARY @@ -12,17 +12,17 @@ Standard C library .SH SYNOPSIS .nf .B #include <stdio.h> -.PP +.P .BI "void flockfile(FILE *" filehandle ); .BI "int ftrylockfile(FILE *" filehandle ); .BI "void funlockfile(FILE *" filehandle ); .fi -.PP +.P .RS -4 Feature Test Macro Requirements for glibc (see .BR feature_test_macros (7)): .RE -.PP +.P All functions shown above: .nf /* Since glibc 2.24: */ _POSIX_C_SOURCE >= 199309L @@ -41,13 +41,13 @@ For each library call, these functions wait until the object is no longer locked by a different thread, then lock it, do the requested I/O, and unlock the object again. -.PP +.P (Note: this locking has nothing to do with the file locking done by functions like .BR flock (2) and .BR lockf (3).) -.PP +.P All this is invisible to the C-programmer, but there may be two reasons to wish for more detailed control. On the one hand, maybe @@ -55,7 +55,7 @@ a series of I/O actions by one thread belongs together, and should not be interrupted by the I/O of some other thread. On the other hand, maybe the locking overhead should be avoided for greater efficiency. -.PP +.P To this end, a thread can explicitly lock the .I FILE object, @@ -72,7 +72,7 @@ instead of .BR getc (3) and .BR putc (3). -.PP +.P The .BR flockfile () function waits for @@ -83,11 +83,11 @@ current thread owner of .IR *filehandle , and increments the lockcount. -.PP +.P The .BR funlockfile () function decrements the lock count. -.PP +.P The .BR ftrylockfile () function is a nonblocking version @@ -121,12 +121,11 @@ T{ .BR funlockfile () T} Thread safety MT-Safe .TE -.sp 1 .SH STANDARDS POSIX.1-2008. .SH HISTORY POSIX.1-2001. -.PP +.P These functions are available when .B _POSIX_THREAD_SAFE_FUNCTIONS is defined. |