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comparison packages/hal/i386/linux/current/src/linux_misc.c @ 42:94fd8fbfe8fe ecos-sw-1999-10-05

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Merge from eCos master repository on 1999-10-05-12:38:44-BST
author jlarmour
date Tue, 05 Oct 1999 12:09:26 +0000
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children 41bd4f3a90de
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41:7b92742d1d6f 42:94fd8fbfe8fe
1 //=============================================================================
2 //
3 // linux_misc.c
4 //
5 // Misc code for the Linux HAL
6 //
7 //=============================================================================
8 //####COPYRIGHTBEGIN####
9 //
10 // -------------------------------------------
11 // The contents of this file are subject to the Cygnus eCos Public License
12 // Version 1.0 (the "License"); you may not use this file except in
13 // compliance with the License. You may obtain a copy of the License at
14 // http://sourceware.cygnus.com/ecos
15 //
16 // Software distributed under the License is distributed on an "AS IS"
17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
18 // License for the specific language governing rights and limitations under
19 // the License.
20 //
21 // The Original Code is eCos - Embedded Cygnus Operating System, released
22 // October 31, 1998.
23 //
24 // The Initial Developer of the Original Code is Cygnus. Portions created
25 // by Cygnus are Copyright (C) 1998,1999 Cygnus Solutions. All Rights Reserved.
26 // -------------------------------------------
27 //
28 //####COPYRIGHTEND####
29 //=============================================================================
30 //#####DESCRIPTIONBEGIN####
31 //
32 // Author(s): asl
33 // Contributors:asl
34 // Date: 1999-09-23
35 // Purpose: Misc functions for the Linux HAL
36 // Description: Misc functions for the Linux HAL
37 //
38 //####DESCRIPTIONEND####
39 //
40 //=============================================================================
41
42 #include <pkgconf/hal.h>
43 #include <cyg/infra/cyg_type.h> // base types
44
45 #ifdef CYGPKG_KERNEL
46 # include <pkgconf/kernel.h>
47 #endif
48
49 // This in not correct, but it will do.
50 externC int cyg_hal_sys__newselect(int,int,int,int,int);
51
52 // Here we define an action to do in the idle thread. For the
53 // synthetic architecture it makes no sence to spin eating processor
54 // time that other processes could make use of. Instead we call
55 // select. The itimer will still go off and kick the schedular back
56 // into life so giving up an escape path from the select. There is one
57 // catch 22. This only works if we are using the real time clock for
58 // itimer, not the virtual clock. The virtual clock works on time the
59 // process actually uses. When its sitting in the select it does not
60 // use any time, so the timer does not expire! Also we don't do a
61 // select when the THREAD_YIELD optin is in use since we want the
62 // yield to be called regularly.
63
64 void
65 hal_idle_thread_action(cyg_uint32 loop_count)
66 {
67 #ifndef CYGIMP_IDLE_THREAD_YIELD
68 #ifdef CYGSEM_HAL_I386_LINUX_REAL_TIME
69 cyg_hal_sys__newselect(0,0,0,0,0);
70 #endif
71 #endif
72 }