rom/exec/findsemaphore.c

   1 /*
   2     Copyright © 1995-2017, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: Search a semaphore by name
   6     Lang: english
   7 */
   8
   9 #include <exec/execbase.h>
  10 #include <aros/libcall.h>
  11 #include <proto/exec.h>
  12
  13 #include "exec_intern.h"
  14 #include "exec_debug.h"
  15
  16 /*****************************************************************************
  17
  18     NAME */
  19
  20         AROS_LH1(struct SignalSemaphore *, FindSemaphore,
  21
  22 /*  SYNOPSIS */
  23         AROS_LHA(CONST_STRPTR, name, A1),
  24
  25 /*  LOCATION */
  26         struct ExecBase *, SysBase, 99, Exec)
  27
  28 /*  FUNCTION
  29         Find a semaphore with a given name in the system global semaphore list.
  30         Note that this call doesn't arbitrate for the list - use Forbid() to
  31         do this yourself.
  32
  33     INPUTS
  34         name - Pointer to name.
  35
  36     RESULT
  37         Address of semaphore structure found or NULL.
  38
  39     NOTES
  40
  41     EXAMPLE
  42
  43     BUGS
  44
  45     SEE ALSO
  46
  47     INTERNALS
  48
  49 ******************************************************************************/
  50 {
  51     AROS_LIBFUNC_INIT
  52
  53     struct SignalSemaphore *retVal;
  54
  55     /* Nothing spectacular - just look into the list */
  56 #if defined(__AROSEXEC_SMP__)
  57     EXEC_SPINLOCK_LOCK(&PrivExecBase(SysBase)->SemListSpinLock, NULL, SPINLOCK_MODE_READ);
  58 #endif
  59     retVal = (struct SignalSemaphore *)FindName(&SysBase->SemaphoreList,name);
  60 #if defined(__AROSEXEC_SMP__)
  61     EXEC_SPINLOCK_UNLOCK(&PrivExecBase(SysBase)->SemListSpinLock);
  62 #endif
  63     return retVal;
  64
  65     AROS_LIBFUNC_EXIT
  66 } /* FindSemaphore */
  67