Date: Mon, 29 Dec 2014 00:30:38 +0000 (UTC) From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r276353 - stable/10/sys/kern Message-ID: <201412290030.sBT0Uc07073315@svn.freebsd.org>
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Author: kib Date: Mon Dec 29 00:30:38 2014 New Revision: 276353 URL: https://svnweb.freebsd.org/changeset/base/276353 Log: MFC r275260: Remove lock recursion for the pipe pair mutex, and disable the recursion on mutex initialization. Modified: stable/10/sys/kern/sys_pipe.c Directory Properties: stable/10/ (props changed) Modified: stable/10/sys/kern/sys_pipe.c ============================================================================== --- stable/10/sys/kern/sys_pipe.c Mon Dec 29 00:10:43 2014 (r276352) +++ stable/10/sys/kern/sys_pipe.c Mon Dec 29 00:30:38 2014 (r276353) @@ -315,7 +315,7 @@ pipe_zone_init(void *mem, int size, int pp = (struct pipepair *)mem; - mtx_init(&pp->pp_mtx, "pipe mutex", NULL, MTX_DEF | MTX_RECURSE); + mtx_init(&pp->pp_mtx, "pipe mutex", NULL, MTX_DEF); return (0); } @@ -1770,7 +1770,7 @@ filt_piperead(struct knote *kn, long hin struct pipe *wpipe = rpipe->pipe_peer; int ret; - PIPE_LOCK(rpipe); + PIPE_LOCK_ASSERT(rpipe, MA_OWNED); kn->kn_data = rpipe->pipe_buffer.cnt; if ((kn->kn_data == 0) && (rpipe->pipe_state & PIPE_DIRECTW)) kn->kn_data = rpipe->pipe_map.cnt; @@ -1779,11 +1779,9 @@ filt_piperead(struct knote *kn, long hin wpipe->pipe_present != PIPE_ACTIVE || (wpipe->pipe_state & PIPE_EOF)) { kn->kn_flags |= EV_EOF; - PIPE_UNLOCK(rpipe); return (1); } ret = kn->kn_data > 0; - PIPE_UNLOCK(rpipe); return ret; } @@ -1794,12 +1792,11 @@ filt_pipewrite(struct knote *kn, long hi struct pipe *wpipe; wpipe = kn->kn_hook; - PIPE_LOCK(wpipe); + PIPE_LOCK_ASSERT(wpipe, MA_OWNED); if (wpipe->pipe_present != PIPE_ACTIVE || (wpipe->pipe_state & PIPE_EOF)) { kn->kn_data = 0; kn->kn_flags |= EV_EOF; - PIPE_UNLOCK(wpipe); return (1); } kn->kn_data = (wpipe->pipe_buffer.size > 0) ? @@ -1807,7 +1804,6 @@ filt_pipewrite(struct knote *kn, long hi if (wpipe->pipe_state & PIPE_DIRECTW) kn->kn_data = 0; - PIPE_UNLOCK(wpipe); return (kn->kn_data >= PIPE_BUF); }
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