thread_safety(5) File Formats Manual thread_safety(5)
NAME
thread_safety - list of libc, libpthread and libgen interfaces that are: Not Thread-Safe, Cancellation Points, Cancel Safe, Async Signal
Safe, or Async Cancel Safe
DESCRIPTION
Refer to this manpage when writing thread-safe applications using libc, libpthread and libgen interfaces. This manpage gives the list of
libc, libpthread and libgen interfaces that are: Not Thread-Safe, Cancellation Points, Cancel Safe, Async Signal Safe, or Async Cancel
Safe.
Interfaces That Are Not Thread-Safe
All the interfaces are thread-safe except:
bgets() bufsplit() copylist()
dbmclose() dbminit() delete()
endmntent() fattach() fdetach()
fetch() firstkey() getc_unlocked()
getchar_unlocked() getcontext() getopt()
inet_ntop() inet_pton() isastream()
makecontext() memcntl() nextkey()
putc_unlocked() putchar_unlocked() setcontext()
setmntent() store() strord()
strtold() system() swapcontext()
NOTE: If an interface has a counterpart, then the interface is thread-safe, and the non-is not thread-safe.
Cancellation Points
Cancellation Points can occur when a thread is executing in the following interfaces:
_pututline() accept() aio_suspend()
bgets() bwtmpname() catclose()
catgets() catopen() close()
closedir() closelog() confstr()
connect() copylist() creat()
ctermid() cuserid() dbm_close()
dbm_delete() dbm_fetch() dbm_firstkey()
dbm_nextkey() dbm_open() dbm_store()
devnm() dial() endbwent()
endgrent() endpwent() endusershell()
endutent() endutsent() endutxent()
fclose() fcntl() fdatasync()
fdopen() fflush() fgetc()
fgetpos() fgetpwent() fgets()
fgetwc() fgetws() flock()
fopen() fprintf() fputc()
fputs() fputwc() fputws()
fread() freopen() fscanf()
fseek() fseeko() fsetpos()
fstatvfsdev() fsync() ftell()
ftello() ftw() fwprintf()
fwrite() fwscanf() getbwent()
getc() getc_unlocked() getchar()
getchar_unlocked() getcwd() getdate()
getgrent() getgrgid() getgrgid_r()
getgrnam() getgrnam_r() getlogin()
getlogin_r() getmsg() getpmsg()
getpwent() getpwnam() getpwnam_r()
getpwuid() getpwuid_r() gets()
gettxt() getusershell() getutent()
getutid() getutline() getutxent()
getutsent() getutsid() getutsline()
getutspid() getutxid() getutxline()
getw() getwc() getwchar()
getwd() glob() globfree()
iconv() iconv_close() iconv_open()
initgroups() insque() ioctl()
isastream() lckpwdf() lockf()
lockf64() lseek() lseek64()
mkstemp() msgrcv() msgsnd()
msync() nanosleep() nftw()
nftw2() open() opendir()
openlog() pause() pclose()
perror() pfmt() poll()
popen() pread() printf()
pselect() pthread_cond_timedwait() pthread_cond_wait()
pthread_join() pthread_testcancel() putc()
putc_unlocked() putchar() putchar_unlocked()
putmsg() putpmsg() putpwent()
puts() pututline() pututsline()
pututxline() putw() putwc()
putwchar() putws() pwrite()
read() readdir() readdir_r()
readv() recv() recvfrom()
recvmsg() remove() remque()
rename() rewind() rewinddir()
scandir() scanf() seekdir()
select() semop() send()
sendmsg() sendto() sendfile()
setbwent() setgrent() setpwent()
setusershell() setutent() setutsent()
setutxent() sigpause() sigsuspend()
sigtimedwait() sigwait() sigwaitinfo()
sleep() socket() socketpair()
statvfsdev() strerror() syslog()
system() t_accept() t_alloc()
t_bind() t_close() t_connect()
t_error() t_getinfo() t_getprotaddr()
t_getstate() t_listen() t_look()
t_open() t_optmgmt() t_rcv()
t_rcvconnect() t_rcvdis() t_rcvrel()
t_rcvudata() t_rcvuderr() t_snd()
t_snddis() t_sndrel() t_sndudata()
t_strerror() t_sync() t_unbind()
tcdrain() tmpfile() tmpnam()
ttyname() ttyname_r() ttyslot()
ulckpwdf() undial() ungetc()
ungetwc() unlink() updatebwdb()
usleep() utmpname() vfprintf()
vfscanf() vfwprintf() vpfmt()
vprintf() vscanf() vwprintf()
wait() wait3() waitid()
waitpid() wordexp() wordfree()
wprintf() write() writev()
wscanf()
NOTE: A cancellation point WILL NOT occur when a thread is executing in in a UNIX 2003 conformant application.
Cancel Safe
All the following interfaces are Cancel Safe:
accept() bind() connect() dn_comp()
dn_expand() endhostent() endnetent() endprotoent()
endservent() get_resfield() gethostbyaddr() gethostbyname()
gethostent() getmsg() getnetbyaddr() getnetbyname()
getnetent() getpeername() getpmsg() getprotobyname()
getprotobynumber() getprotoent() getservbyname() getservbyport()
getservent() getsockname() getsockopt() herror()
inet_addr() inet_lnaof() inet_makeaddr() inet_netof()
inet_network() inet_ntoa() isastream() listen()
msync() net_aton() net_ntoa() poll()
putmsg() putpmsg() rcmd() recv()
recvfrom() recvmsg() res_init() res_mkquery()
res_query() res_search() res_send() rexec()
rresvport() ruserok() sbrk() send()
sendfile() sendmsg() sendto() set_resfield()
sethostent() setnetent() setprotoent() setservent()
setsockopt() shutdown() socket() socketpair()
Async Signal Safe
All the following interfaces are Async Signal Safe:
_exit() accept() access() alarm()
bind() cfgetispeed() cfgetospeed() cfsetispeed()
cfsetospeed() chdir() chmod() chown()
close() connect() creat() dup()
dup2() execle() execve() fcntl()
flock() fpathconf() fstat() getegid()
geteuid() getgid() getgroups() getmsg()
getpeername() getpgrp() getpid() getpmsg()
getppid() getsockname() getsockopt() getuid()
isastream() kill() link() listen()
lseek() memset() mkdir() mkfifo()
msync() net_aton() net_ntoa() open()
pathconf() pause() pipe() poll()
putmsg() putpmsg() raise() read()
recv() recvfrom() recvmsg() rename()
rmdir() send() sendfile() sendmsg()
sendto() setgid() setpgid() setsid()
setsockopt() setuid() shutdown() sigaction()
sigaddset() sigdelset() sigemptyset() sigfillset()
sigismember() signal() sigpending() sigprocmask()
sigqueue() sigsuspend() sleep() socket()
socketpair() stat() sysconf() tcdrain()
tcflow() tcflush() tcgetattr() tcgetpgrp()
tcsendbreak() tcsetattr() tcsetpgrp() time()
times() umask() uname() unlink()
utime() wait() waitpid() write()
NOTE: is not Async Signal Safe in a UNIX 2003 conformant application.
Async Cancel Safe
All the following interfaces are Async Cancel Safe:
a64l() abs() accept()
addmntent() atof() atoi()
atol() bcmp() bcopy()
bind() bsearch() bzero()
cfgetispeed() cfgetospeed() cfsetispeed()
cfsetospeed() connect() div()
execv() execve() ffs()
fnmatch() fsetaclentry() ftok()
getclock() getmsg() getpeername()
getpmsg() getrlimit() getsockname()
getsockopt() getsubopt() index()
insque() isalnum() isalpha()
isascii() isastream() iscntrl()
isdigit() isgraph() islower()
isprint() ispunct() isspace()
isupper() iswalnum() iswalpha()
iswcntrl() iswctype() iswdigit()
iswgraph() iswlower() iswprint()
iswpunct() iswspace() iswupper()
iswxdigit() isxdigit() l3tol()
labs() ldiv() lfind()
listen() lsearch() ltol3()
mblen() mbstowcs() mbtowc()
memccpy() memchr() memcmp()
memcpy() memmove() memset()
mkfifo() mktemp() msem_init()
msem_lock() msgrcv() msgsnd()
msync() nanosleep() net_aton()
net_ntoa() pathfind() pause()
poll() pstat() pstat_getlwp()
pthread_cancel() pthread_setcancelstate() pthread_setcanceltype()
putmsg() putpmsg() recv()
recvfrom() recvmsg() remque()
rindex() rmdirp() sbrk()
semop() send() sendfile()
sendmsg() sendto() setaclentry()
setcat() setclock() setrlimit()
setsockopt() shutdown() sigsuspend()
socket() socketpair() strcasecmp()
strcat() strchr() strcmp()
strcoll() strcpy() strcspn()
strdup() strlen() strncasecmp()
strncat() strncmp() strncpy()
strord() strpbrk() strrchr()
strrstr() strspn() strstr()
strtod() strtok_r() strtol()
strtold() strtoul() strxfrm()
swab() tcdrain() tcflow()
tcflush() tcgetattr() tcgetpgrp()
tcgetsid() tcsendbreak() tcsetattr()
tcsetpgrp() toascii() tolower()
toupper() towlower() towupper()
ulimit() wait() wait3()
waitid() wcscat() wcschr()
wcscmp() wcscpy() wcscspn()
wcslen() wcsncat() wcsncmp()
wcsncpy() wcspbrk() wcsrchr()
wcsspn() wcsstr() wcstod()
wcstok() wcstol() wcstombs()
wcstoul() wcswcs() wctomb()
wctype()
SEE ALSO
intro(3C), pthread(3T), signal(5).
Refer to the threads white papers at the and web sites.
thread_safety(5)