Commit Graph

118 Commits

Author SHA1 Message Date
John Birrell
4896148e72 Interrupt threads waiting in select etc.
Submitted by: Alec Wolman <wolman@cs.washington.edu>
1998-11-15 10:01:34 +00:00
John Birrell
e7b7b3f3de Close a window between unlocking a spinlock and changing the thread state. 1998-11-15 09:58:26 +00:00
Dmitrij Tejblum
171a7528a8 Don't call pthread_mutex_lock with _SPINLOCK held.
Made pthread_cond_wait() more similar to pthread_cond_timedwait().

PR:		8375
1998-11-06 21:04:02 +00:00
Dmitrij Tejblum
4b12016bab Fix some bugs in pthread scheduler:
make pthread_yield() more reliable,
  threads always (I hope) preempted at least every 0.1 sec, as intended.

PR:		bin/7744
Submitted by:	"Richard Seaman, Jr." <dick@tar.com>
1998-10-09 19:01:30 +00:00
Dmitrij Tejblum
60abf62bfa Debug when an environment variable set, no when it is unset. 1998-09-30 19:17:51 +00:00
John Birrell
058716097d Revise test code for sigwait and add test code for sigsuspend.
Submitted by: Daniel M. Eischen <eischen@vigrid.com>
1998-09-30 07:08:09 +00:00
John Birrell
d3bb66886d Cosmetic cleansing. This code requires extra work to keep the garbage
collector thread running after a fork.
1998-09-30 06:41:16 +00:00
John Birrell
dc3a8b52c0 Move the cleanup code that frees memory allocated for a dead thread from
the thread kernel into a garbage collector thread which is started when
the fisrt thread is created (other than the initial thread). This
removes the window of opportunity where a context switch will cause a
thread that has locked the malloc spinlock, to enter the thread kernel,
find there is a dead thread and try to free memory, therefore trying
to lock the malloc spinlock against itself.

The garbage collector thread acts just like any other thread, so
instead of having a spinlock to control accesses to the dead thread
list, it uses a mutex and a condition variable so that it can happily
wait to be signalled when a thread exists.
1998-09-30 06:36:56 +00:00
John Birrell
05f3e91279 Use snprintf instead of sprintf to avoid long source file paths from
launching an application into space when someone tries to debug it.

The dead thread list now has it's own link pointer, so use that when
reporting the grateful dead.
1998-09-30 06:29:54 +00:00
John Birrell
54059e9f3f Implementation of an additional state called SIGWAIT (with the previous
one renamed to SIGSUSPEND) to fix sigwait().

Submitted by: Daniel M. Eischen <eischen@vigrid.com>
1998-09-30 06:27:31 +00:00
John Birrell
92ce833722 NULL a pointer after it is freed to avoid trying to free it again. 1998-09-30 06:24:57 +00:00
John Birrell
a247f83316 - Fix the debug macros.
-  Add support of a thread being listed in the dead thread list as well
   as the thread list.
-  Add a new thread state to make sigwait work properly. (Submitted by
   Daniel M. Eischen <eischen@vigrid.com>)
-  Add global variable for the garbage collector mutex and condition
   variable.
-  Delete a couple of prototypes that are no longer required.
-  Add a prototype for the garbage collector thread.
1998-09-30 06:22:07 +00:00
Doug Rabson
1624bd7303 Change to a code sequence which is more likely to work on SMP systems.
Now all I need is an alpha SMP box to port FreeBSD to :-)
1998-09-16 09:27:05 +00:00
Dmitrij Tejblum
deb9688ae1 In libc_r, rename vfork syscall to _thread_sys_vfork and make vfork an alias
to fork. It is difficult to do real vfork in libc_r, since almost every
operation with file descriptsor changes _thread_fd_table and friends.

popen(3) works much better with this change.
1998-09-12 22:03:20 +00:00
Alexander Langer
cecc7b0974 Removed unused variables. 1998-09-07 21:55:01 +00:00
Alexander Langer
e66632a35c Removed some variable initializations which were unnecessary and divergent
from style(9).
1998-09-07 21:07:59 +00:00
Alexander Langer
23424a1f9a -Wall clean. 1998-09-07 19:23:55 +00:00
Alexander Langer
c0e366326f Implement pthread read/write locks as defined by Version 2 of the Single
UNIX Specification.

As with our standard mutexes, process shared locks are not supported at
this time.
1998-09-07 19:01:43 +00:00
Wolfram Schneider
acd8019083 Sort cross references. 1998-08-31 16:41:09 +00:00
John Birrell
5f867deba5 Don't automatically restart syscalls for the signals that the thread
kernel needs.
1998-08-26 20:55:31 +00:00
John Birrell
353a159590 Back out most of the last commit. It created problems with sigpause. 1998-08-26 20:50:42 +00:00
John Birrell
ad8f637466 Add support for building test programs. 1998-08-25 12:33:22 +00:00
John Birrell
42f37683ee Fix for sigwait problem.
Submitted by: Daniel M. Eischen <eischen@vigrid.com>
PR:           misc/7039
1998-08-25 11:19:14 +00:00
John Birrell
bbf157fac4 Add extra initialisation code that is required for processes that
are started instead of init (pid = 1). This allows an embedded
implementation quite like VxWorks, with (possibly) a single threaded
program running instead of init. The neat thing is that the same threaded
process can run in a multi-user workstation environment too.
1998-08-10 01:24:22 +00:00
Bruce Evans
30b854394a Changed prototype in synopsis to match prototype in <pthread.h>. 1998-08-03 16:54:51 +00:00
Alexander Langer
8ac3b85e63 The pthreads standard has been published. Change:
...is expected to conform to IEEE (``POSIX'') Std 1003.1c when it is
   published.
to:
   ...conforms to ISO/IEC 9945-1 ANSI/IEEE (``POSIX'') Std 1003.1 Second
   Edition 1996-07-12.

Discussed with:	jb
1998-08-03 00:58:37 +00:00
Alexander Langer
b4ff1b7295 A style fix for my previous commit. 1998-08-02 23:07:25 +00:00
Alexander Langer
27aa2e8958 Fixed a race condition during the first lock/trylock of a statically
initialized mutex.  Statically initialized mutexes are actually
initialized at first use (pthread_mutex_lock/pthread_mutex_trylock).
To prevent concurrent initialization by multiple threads, all
static initializations are now serialized by a spinlock.

Reviewed by:	jb
1998-08-02 17:04:25 +00:00
Poul-Henning Kamp
1fbdc08dfe I've put together man pages for the pthread_cleanup, pthread_cond, and
pthread_mutex routines. I've also tweaked pthread_create.3 to point to
pthread_cleanup_push(3) and pthread_cleanup_pop(3).

PR:		7450
Submitted by:	Brian Cully <shmit@kublai.com>
1998-07-31 09:09:19 +00:00
Bruce Evans
bcc58f6898 Fixed a printf format error. Didn't fix assumption that sigset_t is
integral.
1998-06-30 18:00:11 +00:00
John Birrell
ff09ba5fbb Add the missing {} that caused the function to return ESRCH if it
had to wait for the thread to exit and if the caller didn't want the
thread exit status.
1998-06-25 00:04:21 +00:00
John Birrell
b9148b8a3e Don't allow a SIGCHLD to wake up a thread if the process has the default
signal handler installed for SIGCHLD. The ACE MT_SOCK_Test was hanging
as the result of being interrupted when it didn't expect to be.
1998-06-17 22:29:12 +00:00
John Birrell
d989fc8faa If a thread is waiting on a child process to complete, the SIGCHLD
signal can arrive before the thread is woken from it's wait4. In this
case, don't return an EINTR, just set the thread state to running and
the wait4 wrapper will loop and get the exit status of the process.
1998-06-17 03:53:16 +00:00
Peter Wemm
02a93d74e0 Don't compile in the use of poll() when building libc_r. This isn't
so much a "fix", rather a bandaid to buy time to fix it properly
within the thread engine.
1998-06-14 11:25:46 +00:00
John Birrell
597035b4db If a short write, only loop if no error. 1998-06-14 09:36:14 +00:00
John Birrell
0b99d9d8ac Add poll to the list of hidden syscalls so that it gets renamed. This
propagates a bug (that there is no poll wrapper in libc_r), but it
prevents GNU configure scripts from trying to use it in preference
to select. libc_r really needs to change it's wait interface to use
poll instead of select because poll is more a superset of select that
the other way around.

This should allow the Roxen web server to work out-of-the-box. It's
configuration intercae is kinda neat. The code isn't. Shiver. 8-)
1998-06-12 02:21:27 +00:00
John Birrell
06ca87e9f7 Update the caller's descriptor masks even if there are none ready for
I/O for those applications that don't believe the return value of zero as
meaning that THERE ARE *NO* DESCRIPTORS READY.
1998-06-12 02:17:18 +00:00
John Birrell
8eb25828ad Check the access mode in the flags before waiting on a read or a write
that might never be possible if the file was not opened in the corrent
mode. This prevents a hang for bad programs. Why do people code like that?
1998-06-10 22:28:45 +00:00
John Birrell
aef774b0d5 Remove SA_RESTART from the signal dispatch in user-space since this
seems to be tripping up a lot of applications.
1998-06-10 22:25:18 +00:00
John Birrell
3c165ef7b7 When doing a F_SETFL, read the flags back so that the ones stored
in the file descriptor table are exactly what the kernel knows subject
to the O_NONBLOCK flag being requested by the user.
1998-06-10 22:24:12 +00:00
John Birrell
627961e45f Add a commented out CFLAGS entry that can be uncommented to compile thread
lock debug into libc_r. I don't know if this is the best place to document
this, but at least it is recorded somewhere. 8-)
1998-06-09 23:25:13 +00:00
John Birrell
ddc8afd422 Implement compile time debug support instead of tracking file name and
line number every time a file descriptor is locked.

This looks like a big change but it isn't. It should reduce the size
of libc_r and make it run slightly faster.
1998-06-09 23:21:05 +00:00
John Birrell
3411c10600 Add support for compile time debug. This is enabled if libc_r is built
with -D_LOCK_DEBUG. This adds the file name and line number to each lock
call and these are stored in the spinlock structure. When using debug
mode, the lock function will check if the thread is trying to lock
something it has already locked. This is not supposed to happen because
the lock will be freed too early.

Without lock debug, libc_r should be smaller and slightly faster.
1998-06-09 23:13:10 +00:00
John Birrell
74ebed9424 POSIX says that pthread_exit() is not allowed to be called from a
cleanup destructor, so trap this case to prevent me from being being
burnt again by applications that try to do this. With this change, an
application (like one using a mis-configured ACE) will exit the process
after displaying a message quoting the POSIX section that the application
has violated.
1998-06-09 23:08:41 +00:00
John Birrell
27949f44dc Add compile time thread lock debug support.
Add a thread specific flag to trap the case where pthread_exit() is
called from a destructor in violation of the Posix standard.
1998-06-09 23:02:43 +00:00
John Birrell
7d24d0302f Delete the atomic unlock function since it is no longer required.
Simplify the atomic lock to just write a value of 1 to the lock instead
of taking the value passed by the caller (which just confused things).
1998-06-09 08:25:41 +00:00
John Birrell
3dcb4f7556 Atomic lock asm code for the alpha version of libc_r. 1998-06-09 08:21:55 +00:00
John Birrell
2d8a580416 Add a warning message for a thread locking against itself. This is
not supposed to happen, but I have seen bogus g++ code that causes
it.
1998-06-06 07:27:06 +00:00
John Birrell
c6831395f4 Simplify the handling of thread specific data. Only track if a key
is allocated or not, rather than keeping a count and attempting to
know it it is in-use. POSIX says that once a key is deleted, using the
key again results in undefined behaviour.
1998-06-06 07:24:24 +00:00
John Birrell
c359f976b4 Re-design the thread specific key structure. 1998-06-06 07:20:23 +00:00