Date: Thu, 4 Feb 1999 15:50:50 -0800 (PST) From: Matt Dillon <dillon@FreeBSD.ORG> To: cvs-committers@FreeBSD.ORG, cvs-all@FreeBSD.ORG Subject: cvs commit: src/sys/kern sys_pipe.c Message-ID: <199902042350.PAA09647@freefall.freebsd.org>
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dillon 1999/02/04 15:50:49 PST
Modified files:
sys/kern sys_pipe.c
Log:
Fix race in pipe read code whereby a blocked lock can allow another
process to sneak in and write to or close the pipe. The read code
enters a 'piperd' state after doing the lock operation without
checking to see if the state changed, which can cause the process
to wait forever.
The code has also been documented more.
Revision Changes Path
1.50 +39 -20 src/sys/kern/sys_pipe.c
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