Date: Tue, 5 Jun 2007 00:16:43 +0000 (UTC) From: Jeff Roberson <jeff@FreeBSD.org> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/amd64/amd64 cpu_switch.S Message-ID: <200706050016.l550GhDH093630@repoman.freebsd.org>
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jeff 2007-06-05 00:16:43 UTC
FreeBSD src repository
Modified files:
sys/amd64/amd64 cpu_switch.S
Log:
- Add a new argument to cpu_switch. This is a pointer to a mutex that
oldthread should point at before we return.
- When cpu_switch() is called the td_lock pointer in the old thread may
point at the blocked lock. This prevents other processors from
switching into this thread while we're still switching out. Wait
until we're done deactivating the vmspace before we release the
thread by assigning to td_lock.
- Before we can activate the new vmspace we must make sure that the new
thread is not assigned to the blocked lock. It may be in the process
of switching out on another cpu. Spin until the new thread is
available.
Revision Changes Path
1.157 +27 -14 src/sys/amd64/amd64/cpu_switch.S
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