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annotate packages/hal/i386/linux/current/src/linux_misc.c @ 64:c38311975d4f ecos-sw-2000-01-28

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Merge from eCos master repository on 2000-01-28-04:28:11-GMT
author jlarmour
date Fri, 28 Jan 2000 04:59:39 +0000
parents 41bd4f3a90de
children bf00f99aec69
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1 //=============================================================================
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2 //
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3 // linux_misc.c
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4 //
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5 // Misc code for the Linux HAL
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6 //
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7 //=============================================================================
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8 //####COPYRIGHTBEGIN####
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9 //
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10 // -------------------------------------------
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11 // The contents of this file are subject to the Red Hat eCos Public License
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12 // Version 1.0 (the "License"); you may not use this file except in
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13 // compliance with the License. You may obtain a copy of the License at
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14 // http://sourceware.cygnus.com/ecos
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15 //
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16 // Software distributed under the License is distributed on an
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 // License for the specific language governing rights and limitations under
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19 // the License.
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20 //
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21 // The Original Code is eCos - Embedded Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
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30 //####COPYRIGHTEND####
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31 //=============================================================================
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32 //#####DESCRIPTIONBEGIN####
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33 //
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34 // Author(s): asl
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35 // Contributors:asl
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36 // Date: 1999-09-23
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37 // Purpose: Misc functions for the Linux HAL
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38 // Description: Misc functions for the Linux HAL
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39 //
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40 //####DESCRIPTIONEND####
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41 //
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42 //=============================================================================
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43
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44 #include <pkgconf/hal.h>
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45 #include <cyg/infra/cyg_type.h> // base types
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46
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47 #ifdef CYGPKG_KERNEL
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48 # include <pkgconf/kernel.h>
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49 #endif
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50
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51 // This is not correct, but it will do.
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52 externC int cyg_hal_sys__newselect(int,int,int,int,int);
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53
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54 // Here we define an action to do in the idle thread. For the
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55 // synthetic architecture it makes no sense to spin eating processor
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56 // time that other processes could make use of. Instead we call
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57 // select. The itimer will still go off and kick the scheduler back
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58 // into life so giving up an escape path from the select. There is one
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59 // catch-22: this only works if we are using the real time clock for
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60 // itimer, not the virtual clock. The virtual clock works on time the
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61 // process actually uses. When it's sitting in the select it does not
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62 // use any time, so the timer does not expire! Also we don't do a
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63 // select when the THREAD_YIELD option is in use since we want the
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64 // yield to be called regularly.
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65
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66 void
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67 hal_idle_thread_action(cyg_uint32 loop_count)
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68 {
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69 #ifndef CYGIMP_IDLE_THREAD_YIELD
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70 #ifdef CYGSEM_HAL_I386_LINUX_REAL_TIME
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71 cyg_hal_sys__newselect(0,0,0,0,0);
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72 #endif
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73 #endif
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74 }