contrib/gthr_supp_vxw_5x.c

   1 /* Kernel-side additional module for the VxWorks threading support
   2    logic for GCC.  Written 2002 by Zack Weinberg.
   3
   4    This file is distributed with GCC, but it is not part of GCC.
   5    The contents of this file are in the public domain.  */
   6
   7 /* If you are using the Tornado IDE, copy this file to
   8    $WIND_BASE/target/config/comps/src/gthread_supp.c.  Then create a
   9    file named 10comp_gthread_supp.cdf in target/config/comps/vxWorks
  10    with the following contents:
  11
  12    Component INCLUDE_GCC_GTHREAD {
  13       NAME                GCC 3.x gthread support (required by C++)
  14       CONFIGLETTES        gthread_supp.c
  15       REQUIRES            INCLUDE_CPLUS
  16       INCLUDE_WHEN        INCLUDE_CPLUS
  17       _FOLDER             FOLDER_CPLUS
  18    }
  19
  20    If you are using command line builds, instead copy this file to
  21    $WIND_BASE/target/src/config/gthread_supp.c, and add the following
  22    block to target/src/config/usrExtra.c:
  23
  24    #ifdef INCLUDE_CPLUS
  25    #include "../../src/config/gthread_supp.c"
  26    #endif
  27
  28    You should now be able to rebuild your application using GCC 3.x.  */
  29
  30 #include <vxWorks.h>
  31 #include <taskLib.h>
  32
  33 /* This file provides these routines:  */
  34 extern void *__gthread_get_tsd_data (WIND_TCB *tcb);
  35 extern void __gthread_set_tsd_data (WIND_TCB *tcb, void *data);
  36
  37 extern void __gthread_enter_tsd_dtor_context (WIND_TCB *tcb);
  38 extern void __gthread_leave_tsd_dtor_context (WIND_TCB *tcb);
  39
  40 /* Set and retrieve the TSD data block for the task TCB.
  41
  42    Possible choices for TSD_SLOT are:
  43      reserved1
  44      reserved2
  45      spare1
  46      spare2
  47      spare3
  48      spare4
  49    (these are all fields of the TCB structure; all have type 'int').
  50
  51    If you find that the slot chosen by default is already used for
  52    something else, simply change the #define below and recompile this
  53    file.  No other file should reference TSD_SLOT directly.  */
  54
  55 /* WARNING: This code is not 64-bit clean (it assumes that a pointer
  56    can be held in an 'int' without truncation).  As much of the rest
  57    of VxWorks also makes this assumption, we can't really avoid it.  */
  58
  59 #define TSD_SLOT reserved1
  60
  61 void *
  62 __gthread_get_tsd_data (WIND_TCB *tcb)
  63 {
  64   return (void *) (tcb->TSD_SLOT);
  65 }
  66
  67 void
  68 __gthread_set_tsd_data (WIND_TCB *tcb, void *data)
  69 {
  70   tcb->TSD_SLOT = (int) data;
  71 }
  72
  73 /* Enter and leave "TSD destructor context".  This is defined as a
  74    state in which it is safe to call free() from a task delete hook
  75    on a memory block allocated by the task being deleted.
  76    For VxWorks 5.x, nothing needs to be done.  */
  77
  78 #if __GNUC__ >= 2
  79 #define UNUSED __attribute__((unused))
  80 #else
  81 #define UNUSED
  82 #endif
  83
  84 void
  85 __gthread_enter_tsd_dtor_context (WIND_TCB *tcb UNUSED)
  86 {
  87 }
  88
  89 void
  90 __gthread_leave_tsd_dtor_context (WIND_TCB *tcb UNUSED)
  91 {
  92 }