Commit Graph

31 Commits

Author SHA1 Message Date
David E. O'Brien
ea8d448a92 Fix SCM ID's. 2002-02-01 00:57:29 +00:00
Daniel Eischen
d201fe46e3 Remove _THREAD_SAFE and make libc thread-safe by default by
adding (weak definitions to) stubs for some of the pthread
functions.  If the threads library is linked in, the real
pthread functions will pulled in.

Use the following convention for system calls wrapped by the
threads library:
	__sys_foo - actual system call
	_foo - weak definition to __sys_foo
	foo - weak definition to __sys_foo

Change all libc uses of system calls wrapped by the threads
library from foo to _foo.  In order to define the prototypes
for _foo(), we introduce namespace.h and un-namespace.h
(suggested by bde).  All files that need to reference these
system calls, should include namespace.h before any standard
includes, then include un-namespace.h after the standard
includes and before any local includes.  <db.h> is an exception
and shouldn't be included in between namespace.h and
un-namespace.h  namespace.h will define foo to _foo, and
un-namespace.h will undefine foo.

Try to eliminate some of the recursive calls to MT-safe
functions in libc/stdio in preparation for adding a mutex
to FILE.  We have recursive mutexes, but would like to avoid
using them if possible.

Remove uneeded includes of <errno.h> from a few files.

Add $FreeBSD$ to a few files in order to pass commitprep.

Approved by:	-arch
2001-01-24 13:01:12 +00:00
Jason Evans
b479399f73 Take care to avoid having "strong" and "weak" symbols of the same name in
libc_r.
2000-03-16 02:14:41 +00:00
Jason Evans
9233c4d942 Simplify sytem call renaming. Instead of _foo() <-- _libc_foo <-- foo(),
just use _foo() <-- foo().  In the case of a libpthread that doesn't do
call conversion (such as linuxthreads and our upcoming libpthread), this
is adequate.  In the case of libc_r, we still need three names, which are
now _thread_sys_foo() <-- _foo() <-- foo().

Convert all internal libc usage of: aio_suspend(), close(), fsync(), msync(),
nanosleep(), open(), fcntl(), read(), and write() to _foo() instead of foo().

Remove all internal libc usage of: creat(), pause(), sleep(), system(),
tcdrain(), wait(), and waitpid().

Make thread cancellation fully POSIX-compliant.

Suggested by:	deischen
2000-01-27 23:07:25 +00:00
Jason Evans
929273386f Add three-tier symbol naming in support of POSIX thread cancellation
points.  For library functions, the pattern is __sleep() <--
_libc_sleep() <-- sleep().  The arrows represent weak aliases.  For
system calls, the pattern is _read() <-- _libc_read() <-- read().
2000-01-12 09:23:48 +00:00
Peter Wemm
7f3dea244c $Id$ -> $FreeBSD$ 1999-08-28 00:22:10 +00:00
Andrey A. Chernov
7f41a65ede restore rev 1.23 to give clear SIGALRM handling example, 68 years
are too long to affect real code
1998-09-08 09:44:46 +00:00
Matthew Dillon
49d6409ac7 Reviewed by: Andrey A. Chernov <ache@nagual.pp.ru>, Doug Rabson <dfr@nlsystems.com>
Rewrote sleep() to remove int/long typing assumptions between the argument
    to the function and the timespec structure.
1998-09-06 09:11:06 +00:00
John Birrell
ae59c2591e Use INT_MAX instead of LONG_MAX since the variable being compared
is an int, not a long.
1998-09-05 08:01:26 +00:00
Andrey A. Chernov
8cfedef0e6 Fix LONG_MAX overflowing
Return seconds if errno other than EINTR
Add $Id
Submitted by: bde with minor optimization by me
1997-10-17 09:35:50 +00:00
Andrey A. Chernov
855a496c94 Copy time_to_sleep to time_remaining since it can be left
uninitialized if nanosleep returns early with agr error
1997-10-16 21:31:43 +00:00
Andrey A. Chernov
49620c896c Cleanup #includes 1997-10-16 13:35:25 +00:00
Peter Wemm
9f375c3252 Give up on the "try and compensate for broken programs" cruft and revert
back to the original single nanosleep() implementation.  This is POSIX and
Unix98 (aka single-unix spec v2) compliant behavior.  If a program sets
alarm(2) or an interval timer (setitimer(2)) without a SIGALRM handler
being active, sleep(3) will no longer absorb it, and the program will get
what it asked for..... :-]

The original reason for this in the first place (apache) doesn't seem to
need it anymore, according to Andrey.

Reviewed by: ache, bde
1997-10-15 14:06:15 +00:00
Andrey A. Chernov
3be4b5c3df Back out itimerfix hack since nanosleep1 fixed now
Handle syscalls error return slightly better
1997-08-13 18:13:17 +00:00
Andrey A. Chernov
fc0cc5ad9b Rearrange itimerfix loop doing it inside SIGALRM handling section 1997-08-12 19:54:31 +00:00
Andrey A. Chernov
b39d66c04a Solve itimerfix() problem completely by using loop in 100000000 secs chunks 1997-08-12 19:47:01 +00:00
Andrey A. Chernov
8d7bf613b2 Back out my installation of SIGALRM handler even if it is blocked
and return to previous Peter's variant.
POSIX says that this place is implementation defined and old variant allows
application block SIGALRM and sleep and not be killed by external SIGALRMs.
BTW, GNU sleep f.e. sleeps forever in blocked SIGALRM :-)
1997-08-12 19:14:54 +00:00
Andrey A. Chernov
d23cc31d85 Make itimerfix hack better: return the time we can't sleep at once 1997-08-12 15:46:05 +00:00
Joerg Wunsch
ac77b4810d Hack^H^H^H^Hworkaround for itimerfix(9) gratuitously limiting the
acceptable range for tv_sec to the magic number 100000000 (which at
least ought to be declared in a header file, and explained in the
non-existing man page, as well as in the existing man pages for
nanosleep(2) & Co.).

PR:		bin/4259
1997-08-10 12:16:13 +00:00
Peter Wemm
925d069aa8 Make sleep() and usleep() "eat" any stray SIGALRM signals during the
lifetime of the call, just like the old implementation did.  Previously,
we were only eating them if the application did not call sleep()/usleep()
with SIGALRM masked.

Submitted by:	ache
1997-07-18 09:48:37 +00:00
Peter Wemm
be159dcaf7 Re-activate the nanosleep style using code, but with the signal handling
semantics of the old sleep for compatability with a few decades of expected
side effects.  Apache breaks if we just use nanosleep() for some reason,
here we use a new signanosleep() syscall which is kinda like a hybrid of
sigsuspend and nanosleep..

Reviewed by:  ache (and tested on his apache that was failing when
                    sleep used plain nanosleep)
1997-06-02 16:30:22 +00:00
Peter Wemm
0913e7ce8b Update the sleep(3)/usleep(3) code to use signanosleep(2) if compiled with
-DUSE_NANOSLEEP.  Also, seperate the code for _THREAD_SAFE so that it uses
the simpler threaded nanosleep() call in libc_r..  We don't go to the same
extremes for emulating traditional sleep semantics (ie: eating any SIGALRM
that might happen) which things like apache seem to depend on.
1997-06-01 09:27:03 +00:00
Peter Wemm
304e0890fc Update the nanosleep versions to set a SIGALRM handler while sleeping.
This appears to appease Apache, although depending on having sleep(3)
changing the SIGALRM handler is a bit bogus.
1997-05-18 10:57:49 +00:00
Peter Wemm
7bf1f2c9fa round-up non-zero nanoseconds in #ifdef'ed code. 1997-05-17 15:41:08 +00:00
Peter Wemm
fa0f63238b Allow conditional use (add -DUSE_NANOSLEEP) to CFLAGS of nanosleep() for
the backend of sleep(3) and usleep(3).  It's off by default until the
problem is fixed.
1997-05-17 11:40:58 +00:00
Andrey A. Chernov
e3c1328e9f Temporarily restore old (itimer) sleep variant because new one
(nanosleep) breaks Apache httpd badly: his childs died quickly after
number of requests (SIGPIPE). To reproduce this bug start
gdb /usr/local/sbin/httpd
run -X

and make some bunch of concurent requests (load the server pages
from 3 different places f.e.)
After short time httpd dies via SIGPIPE. It never dies with old sleep.c

In real life it looks like lots of broken images on the pages or missing
pages. Lynx says about Network read error, etc.
It seems something wrong in nanosleep signal handling.
1997-05-17 08:32:42 +00:00
Peter Wemm
511d7b9c07 Use nanosleep() in all cases, not just in the reentrant libc (_THREAD_SAFE)
version.
1997-05-12 10:04:57 +00:00
Nate Williams
34eeb76411 ts_sec -> tv_sec
ts_nsec -> tv_nsec
1996-09-20 06:06:28 +00:00
Julian Elischer
f70177e76e Reviewed by: julian and (hsu?)
Submitted by:	 John Birrel(L?)

changes for threadsafe operations
1996-01-22 00:02:33 +00:00
Poul-Henning Kamp
8b10240709 Minor cleanup, mostly unused vars and missing #includes. 1995-10-22 14:37:11 +00:00
Rodney W. Grimes
58f0484fa2 BSD 4.4 Lite Lib Sources 1994-05-27 05:00:24 +00:00