| critical_enter.9 (88891) | critical_enter.9 (89124) |
|---|---|
| 1.\" Copyright (c) 2001,2002 John H. Baldwin <jhb@FreeBSD.org> 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. --- 8 unchanged lines hidden (view full) --- 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" | 1.\" Copyright (c) 2001,2002 John H. Baldwin <jhb@FreeBSD.org> 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. --- 8 unchanged lines hidden (view full) --- 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" |
| 25.\" $FreeBSD: head/share/man/man9/critical_enter.9 88891 2002-01-04 23:56:17Z jhb $ | 25.\" $FreeBSD: head/share/man/man9/critical_enter.9 89124 2002-01-09 11:43:48Z mpp $ |
| 26.\" 27.Dd March 22, 2001 28.Dt CRITICAL_ENTER 9 29.Os 30.Sh NAME 31.Nm cpu_critical_enter , 32.Nm cpu_critical_exit , 33.Nm critical_enter , --- 6 unchanged lines hidden (view full) --- 40.Fn cpu_critical_enter "void" 41.Ft void 42.Fn cpu_critical_exit "critical_t savecrit" 43.Ft void 44.Fn critical_enter "void" 45.Ft void 46.Fn critical_exit "void" 47.Sh DESCRIPTION | 26.\" 27.Dd March 22, 2001 28.Dt CRITICAL_ENTER 9 29.Os 30.Sh NAME 31.Nm cpu_critical_enter , 32.Nm cpu_critical_exit , 33.Nm critical_enter , --- 6 unchanged lines hidden (view full) --- 40.Fn cpu_critical_enter "void" 41.Ft void 42.Fn cpu_critical_exit "critical_t savecrit" 43.Ft void 44.Fn critical_enter "void" 45.Ft void 46.Fn critical_exit "void" 47.Sh DESCRIPTION |
| 48These functions are used to prevent preemption in a critcal region of code. | 48These functions are used to prevent preemption in a critical region of code. |
| 49All that is guaranteed is that the thread currently executing on a CPU will 50not be preempted. 51Specifically, a thread in a critical region will not migrate to another 52CPU while it is in a critical region. 53The current CPU may still trigger faults and exceptions during a critical 54section; however, these faults are usually fatal. 55.Pp 56The --- 71 unchanged lines hidden --- | 49All that is guaranteed is that the thread currently executing on a CPU will 50not be preempted. 51Specifically, a thread in a critical region will not migrate to another 52CPU while it is in a critical region. 53The current CPU may still trigger faults and exceptions during a critical 54section; however, these faults are usually fatal. 55.Pp 56The --- 71 unchanged lines hidden --- |