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authorrpj <rpj>2002-02-18 03:16:52 +0000
committerrpj <rpj>2002-02-18 03:16:52 +0000
commita416ab17ecf9f2cb0f1e3f7bd645a8d1ce690ca2 (patch)
tree72f776cd64e48824a5578ff7a523bc69097143b4 /sched_setscheduler.c
parente6f1797e9e9925ae7f9dda54806ef8f52ae3ed07 (diff)
Major reorganisation of source code; new routine and tests added.
Diffstat (limited to 'sched_setscheduler.c')
-rw-r--r--sched_setscheduler.c78
1 files changed, 78 insertions, 0 deletions
diff --git a/sched_setscheduler.c b/sched_setscheduler.c
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+/*
+ * sched_setscheduler.c
+ *
+ * Description:
+ * POSIX thread functions that deal with thread scheduling.
+ *
+ * --------------------------------------------------------------------------
+ *
+ * Pthreads-win32 - POSIX Threads Library for Win32
+ * Copyright(C) 1998 John E. Bossom
+ * Copyright(C) 1999,2002 Pthreads-win32 contributors
+ *
+ * Contact Email: rpj@ise.canberra.edu.au
+ *
+ * The current list of contributors is contained
+ * in the file CONTRIBUTORS included with the source
+ * code distribution. The list can also be seen at the
+ * following World Wide Web location:
+ * http://sources.redhat.com/pthreads-win32/contributors.html
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library in the file COPYING.LIB;
+ * if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ */
+
+#include "pthread.h"
+#include "implement.h"
+#include "sched.h"
+
+int
+sched_setscheduler(pid_t pid, int policy)
+{
+ /*
+ * Win32 only has one policy which we call SCHED_OTHER.
+ * However, we try to provide other valid side-effects
+ * such as EPERM and ESRCH errors. Choosing to check
+ * for a valid policy last allows us to get the most value out
+ * of this function.
+ */
+ if (0 != pid)
+ {
+ int selfPid = (int) GetCurrentProcessId();
+
+ if (pid != selfPid)
+ {
+ HANDLE h = OpenProcess(PROCESS_SET_INFORMATION, FALSE, (DWORD) pid);
+
+ if (NULL == h)
+ {
+ errno = (GetLastError() == (0xFF & ERROR_ACCESS_DENIED)) ? EPERM : ESRCH;
+ return -1;
+ }
+ }
+ }
+
+ if (SCHED_OTHER != policy)
+ {
+ errno = ENOSYS;
+ return -1;
+ }
+
+ /*
+ * Don't set anything because there is nothing to set.
+ * Just return the current (the only possible) value.
+ */
+ return SCHED_OTHER;
+}