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| author | Ulrich Drepper <drepper@redhat.com> | 2006-01-11 08:10:42 +0000 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 2006-01-11 08:10:42 +0000 |
| commit | af047cff7142b324f9236a745ee9cafb400434ba (patch) | |
| tree | fa3b4845c252ff7121bcb220944de144c9f1dd35 /libio | |
| parent | 7876272372451b1cb0a7da9cfbbf9027550bccce (diff) | |
| download | glibc-af047cff7142b324f9236a745ee9cafb400434ba.tar.gz glibc-af047cff7142b324f9236a745ee9cafb400434ba.tar.xz glibc-af047cff7142b324f9236a745ee9cafb400434ba.zip | |
* libio/genops.c (_IO_unbuffer_write): Give concurrently running
threads the chance to work correctly by trying to lock the stream. If this does not work, proceed without locking.
Diffstat (limited to 'libio')
| -rw-r--r-- | libio/genops.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/libio/genops.c b/libio/genops.c index 3deb044a08..da29ade4e6 100644 --- a/libio/genops.c +++ b/libio/genops.c @@ -947,6 +947,16 @@ _IO_unbuffer_write (void) /* Iff stream is un-orientated, it wasn't used. */ && fp->_mode != 0) { + int cnt; +#define MAXTRIES 2 + for (cnt = 0; cnt < MAXTRIES; ++cnt) + if (_IO_lock_trylock (*fp->_lock) == 0) + break; + else + /* Give the other thread time to finish up its use of the + stream. */ + __sched_yield (); + if (! dealloc_buffers && !(fp->_flags & _IO_USER_BUF)) { fp->_flags |= _IO_USER_BUF; @@ -958,6 +968,9 @@ _IO_unbuffer_write (void) } _IO_SETBUF (fp, NULL, 0); + + if (cnt < MAXTRIES) + _IO_lock_unlock (*fp->_lock); } /* Make sure that never again the wide char functions can be |