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authorcvs2svn <>2014-02-18 19:58:41 +0000
committercvs2svn <>2014-02-18 19:58:41 +0000
commitb5279ecc51ff751ccd052fbb7c20efd529575f7e (patch)
tree64141e96a5d64ae59fb7f410270e4daa41878a03 /winsup/cygserver/bsd_mutex.cc
parenta2a48cb593a9b3cc3f5c63c39f52c32db31cec50 (diff)
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This commit was manufactured by cvs2svn to create tag 'cygwin-pre-user-db'.cygwin-pre-user-db
Sprout from cygwin-1_7_29-release-branchpoint 2014-02-18 19:58:40 UTC cvs2svn 'This commit was manufactured by cvs2svn to create branch 'cygwin-1_7_29' Cherrypick from master 2014-02-08 22:25:11 UTC Corinna Vinschen <corinna@vinschen.de> 'Fix ChangeLog': winsup/cygwin/ChangeLog winsup/cygwin/miscfuncs.cc winsup/cygwin/miscfuncs.h winsup/cygwin/mount.cc Delete: winsup/COPYING winsup/CYGWIN_LICENSE winsup/ChangeLog winsup/Makefile.common winsup/Makefile.in winsup/README winsup/acinclude.m4 winsup/aclocal.m4 winsup/autogen.sh winsup/c++wrap winsup/ccwrap winsup/config.guess winsup/config.sub winsup/configure winsup/configure.ac winsup/configure.cygwin winsup/cygserver/ChangeLog winsup/cygserver/ChangeLog.64bit winsup/cygserver/Makefile.in winsup/cygserver/README winsup/cygserver/aclocal.m4 winsup/cygserver/autogen.sh winsup/cygserver/bsd_helper.cc winsup/cygserver/bsd_helper.h winsup/cygserver/bsd_log.cc winsup/cygserver/bsd_log.h winsup/cygserver/bsd_mutex.cc winsup/cygserver/bsd_mutex.h 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winsup/utils/cygwin-console-helper.cc winsup/utils/dump_setup.cc winsup/utils/dumper.cc winsup/utils/dumper.h winsup/utils/getconf.c winsup/utils/getfacl.c winsup/utils/kill.cc winsup/utils/ldd.cc winsup/utils/ldh.cc winsup/utils/loadlib.h winsup/utils/locale.cc winsup/utils/minidumper.cc winsup/utils/mkgroup.c winsup/utils/mkpasswd.c winsup/utils/module_info.cc winsup/utils/mount.cc winsup/utils/parse_pe.cc winsup/utils/passwd.c winsup/utils/path.cc winsup/utils/path.h winsup/utils/pldd.c winsup/utils/ps.cc winsup/utils/regtool.cc winsup/utils/setfacl.c winsup/utils/setmetamode.c winsup/utils/ssp.c winsup/utils/ssp.txt winsup/utils/strace.cc winsup/utils/testsuite.cc winsup/utils/testsuite.h winsup/utils/tzset.c winsup/utils/umount.cc winsup/utils/utils.xml winsup/utils/wide_path.h
Diffstat (limited to 'winsup/cygserver/bsd_mutex.cc')
-rw-r--r--winsup/cygserver/bsd_mutex.cc386
1 files changed, 0 insertions, 386 deletions
diff --git a/winsup/cygserver/bsd_mutex.cc b/winsup/cygserver/bsd_mutex.cc
deleted file mode 100644
index a13cfe07d..000000000
--- a/winsup/cygserver/bsd_mutex.cc
+++ /dev/null
@@ -1,386 +0,0 @@
-/* bsd_mutex.cc
-
- Copyright 2003, 2004, 2005, 2007, 2012 Red Hat Inc.
-
-This file is part of Cygwin.
-
-This software is a copyrighted work licensed under the terms of the
-Cygwin license. Please consult the file "CYGWIN_LICENSE" for
-details. */
-#ifdef __OUTSIDE_CYGWIN__
-#include "woutsup.h"
-#include <errno.h>
-#define _KERNEL 1
-#define __BSD_VISIBLE 1
-#include <sys/smallprint.h>
-#include <limits.h>
-#include <stdlib.h>
-#include <sys/msg.h>
-#include <sys/sem.h>
-
-#include "process.h"
-#include "cygserver_ipc.h"
-
-/* A BSD kernel global mutex. */
-struct mtx Giant;
-
-void
-mtx_init (mtx *m, const char *name, const void *, int)
-{
- m->name = name;
- m->owner = 0;
- m->cnt = 0;
- /* Can't use Windows Mutexes here since Windows Mutexes are only
- unlockable by the lock owner. */
- m->h = CreateSemaphore (NULL, 1, 1, NULL);
- if (!m->h)
- panic ("couldn't allocate %s mutex, %lu\n", name, GetLastError ());
-}
-
-void
-_mtx_lock (mtx *m, DWORD winpid, const char *file, int line)
-{
- _log (file, line, LOG_DEBUG, "Try locking mutex %s (%u) (hold: %u)",
- m->name, winpid, m->owner);
- if (WaitForSingleObject (m->h, INFINITE) != WAIT_OBJECT_0)
- _panic (file, line, "wait for %s in %d failed, %lu", m->name, winpid,
- GetLastError ());
- m->owner = winpid;
- _log (file, line, LOG_DEBUG, "Locked mutex %s/%u (%u)",
- m->name, ++m->cnt, winpid);
-}
-
-int
-mtx_owned (mtx *m, DWORD winpid)
-{
- return m->owner == winpid;
-}
-
-void
-_mtx_assert (mtx *m, int what, DWORD winpid, const char *file, int line)
-{
- switch (what)
- {
- case MA_OWNED:
- if (!mtx_owned (m, winpid))
- _panic (file, line, "Mutex %s not owned", m->name);
- break;
- case MA_NOTOWNED:
- if (mtx_owned (m, winpid))
- _panic (file, line, "Mutex %s is owned", m->name);
- break;
- default:
- break;
- }
-}
-
-void
-_mtx_unlock (mtx *m, const char *file, int line)
-{
- DWORD owner = m->owner;
- unsigned long cnt = m->cnt;
- m->owner = 0;
- /* Cautiously check if mtx_destroy has been called (shutdown).
- In that case, m->h is NULL. */
- if (m->h && !ReleaseSemaphore (m->h, 1, NULL))
- {
- /* Check if the semaphore was already on it's max value. */
- if (GetLastError () != ERROR_TOO_MANY_POSTS)
- _panic (file, line, "release of mutex %s failed, %lu", m->name,
- GetLastError ());
- }
- _log (file, line, LOG_DEBUG, "Unlocked mutex %s/%u (owner: %u)",
- m->name, cnt, owner);
-}
-
-void
-mtx_destroy (mtx *m)
-{
- HANDLE tmp = m->h;
- m->h = NULL;
- if (tmp)
- CloseHandle (tmp);
-}
-
-/*
- * Helper functions for msleep/wakeup.
- */
-
-static int
-win_priority (int priority)
-{
- int p = (int)((priority) & PRIO_MASK) - PZERO;
- /* Generating a valid priority value is a bit tricky. The only valid
- values on NT4 are -15, -2, -1, 0, 1, 2, 15. */
- switch (p)
- {
- case -15: case -14: case -13: case -12: case -11:
- return THREAD_PRIORITY_IDLE;
- case -10: case -9: case -8: case -7: case -6:
- return THREAD_PRIORITY_LOWEST;
- case -5: case -4: case -3: case -2: case -1:
- return THREAD_PRIORITY_BELOW_NORMAL;
- case 0:
- return THREAD_PRIORITY_NORMAL;
- case 1: case 2: case 3: case 4: case 5:
- return THREAD_PRIORITY_ABOVE_NORMAL;
- case 6: case 7: case 8: case 9: case 10:
- return THREAD_PRIORITY_HIGHEST;
- case 11: case 12: case 13: case 14: case 15:
- return THREAD_PRIORITY_TIME_CRITICAL;
- }
- return THREAD_PRIORITY_NORMAL;
-}
-
-/*
- * Sets the thread priority, returns the old priority.
- */
-static int
-set_priority (int priority)
-{
- int old_prio = GetThreadPriority (GetCurrentThread ());
- if (!SetThreadPriority (GetCurrentThread (), win_priority (priority)))
- log (LOG_WARNING,
- "Warning: Setting thread priority to %d failed with error %lu\n",
- win_priority (priority), GetLastError ());
- return old_prio;
-}
-
-/*
- * Original description from BSD code:
- *
- * General sleep call. Suspends the current process until a wakeup is
- * performed on the specified identifier. The process will then be made
- * runnable with the specified priority. Sleeps at most timo/hz seconds
- * (0 means no timeout). If pri includes PCATCH flag, signals are checked
- * before and after sleeping, else signals are not checked. Returns 0 if
- * awakened, EWOULDBLOCK if the timeout expires. If PCATCH is set and a
- * signal needs to be delivered, ERESTART is returned if the current system
- * call should be restarted if possible, and EINTR is returned if the system
- * call should be interrupted by the signal (return EINTR).
- *
- * The mutex argument is exited before the caller is suspended, and
- * entered before msleep returns. If priority includes the PDROP
- * flag the mutex is not entered before returning.
- */
-static HANDLE msleep_glob_evt;
-
-class msleep_sync_array
-{
- enum msleep_action {
- MSLEEP_ENTER = 0,
- MSLEEP_LEAVE,
- MSLEEP_WAKEUP
- };
-
- CRITICAL_SECTION cs;
- long cnt;
- long max_cnt;
- struct msleep_record {
- void *ident;
- HANDLE wakeup_evt;
- LONG threads;
- } *a;
-
- int find_ident (void *ident, msleep_action action)
- {
- int i;
- for (i = 0; i < cnt; ++i)
- if (a[i].ident == ident)
- return i;
- if (i >= max_cnt)
- panic ("ident %x not found and run out of slots.", ident);
- if (i >= cnt && action == MSLEEP_LEAVE)
- panic ("ident %x not found (%d).", ident, action);
- return i;
- }
-
- HANDLE first_entry (int i, void *ident)
- {
- debug ("New ident %x, index %d", ident, i);
- a[i].ident = ident;
- a[i].wakeup_evt = CreateEvent (NULL, TRUE, FALSE, NULL);
- if (!a[i].wakeup_evt)
- panic ("CreateEvent failed: %lu", GetLastError ());
- debug ("i = %d, CreateEvent: %x", i, a[i].wakeup_evt);
- a[i].threads = 1;
- ++cnt;
- return a[i].wakeup_evt;
- }
-
- HANDLE next_entry (int i)
- {
- if (a[i].ident && WaitForSingleObject (a[i].wakeup_evt, 0) != WAIT_OBJECT_0)
- {
- ++a[i].threads;
- return a[i].wakeup_evt;
- }
- return NULL;
- }
-
-public:
-
- msleep_sync_array (int count) : cnt (0), max_cnt (count)
- {
- InitializeCriticalSection (&cs);
- if (!(a = new msleep_record[count]))
- panic ("Allocating msleep records failed: %d", errno);
- }
-
- HANDLE enter (void *ident)
- {
- HANDLE evt = NULL;
- while (!evt)
- {
- EnterCriticalSection (&cs);
- int i = find_ident (ident, MSLEEP_ENTER);
- if (i >= cnt)
- evt = first_entry (i, ident);
- else if (!(evt = next_entry (i)))
- {
- /* wakeup has been called, so sleep to wait until all
- formerly waiting threads have left and retry. */
- LeaveCriticalSection (&cs);
- Sleep (1L);
- }
- }
- LeaveCriticalSection (&cs);
- return evt;
- }
-
- void leave (void *ident)
- {
- EnterCriticalSection (&cs);
- int i = find_ident (ident, MSLEEP_LEAVE);
- if (--a[i].threads == 0)
- {
- debug ("i = %d, CloseEvent: %x", i, a[i].wakeup_evt);
- CloseHandle (a[i].wakeup_evt);
- a[i].ident = NULL;
- --cnt;
- if (i < cnt)
- a[i] = a[cnt];
- }
- LeaveCriticalSection (&cs);
- }
-
- void wakeup (void *ident)
- {
- EnterCriticalSection (&cs);
- int i = find_ident (ident, MSLEEP_WAKEUP);
- if (i < cnt && a[i].ident)
- SetEvent (a[i].wakeup_evt);
- LeaveCriticalSection (&cs);
- }
-};
-
-static msleep_sync_array *msleep_sync;
-
-void
-msleep_init (void)
-{
- extern struct msginfo msginfo;
- extern struct seminfo seminfo;
-
- msleep_glob_evt = CreateEvent (NULL, TRUE, FALSE, NULL);
- if (!msleep_glob_evt)
- panic ("CreateEvent in msleep_init failed: %lu", GetLastError ());
- int32_t msgmni = support_msgqueues ? msginfo.msgmni : 0;
- int32_t semmni = support_semaphores ? seminfo.semmni : 0;
- TUNABLE_INT_FETCH ("kern.ipc.msgmni", &msgmni);
- TUNABLE_INT_FETCH ("kern.ipc.semmni", &semmni);
- debug ("Try allocating msgmni (%d) + semmni (%d) msleep records",
- msgmni, semmni);
- msleep_sync = new msleep_sync_array (msgmni + semmni);
- if (!msleep_sync)
- panic ("Allocating msleep records in msleep_init failed: %d", errno);
-}
-
-int
-_msleep (void *ident, struct mtx *mtx, int priority,
- const char *wmesg, int timo, struct thread *td)
-{
- int ret = -1;
-
- HANDLE evt = msleep_sync->enter (ident);
-
- if (mtx)
- mtx_unlock (mtx);
- int old_priority = set_priority (priority);
- HANDLE obj[4] =
- {
- evt,
- msleep_glob_evt,
- td->client->handle (),
- td->client->signal_arrived ()
- };
- /* PCATCH handling. If PCATCH is given and signal_arrived is a valid
- handle, then it's used in the WaitFor call and EINTR is returned. */
- int obj_cnt = 3;
- if ((priority & PCATCH)
- && td->client->signal_arrived () != INVALID_HANDLE_VALUE)
- obj_cnt = 4;
- switch (WaitForMultipleObjects (obj_cnt, obj, FALSE, timo ?: INFINITE))
- {
- case WAIT_OBJECT_0: /* wakeup() has been called. */
- ret = 0;
- debug ("msleep wakeup called for %d", td->td_proc->winpid);
- break;
- case WAIT_OBJECT_0 + 1: /* Shutdown event (triggered by wakeup_all). */
- priority |= PDROP;
- /*FALLTHRU*/
- case WAIT_OBJECT_0 + 2: /* The dependent process has exited. */
- debug ("msleep process exit or shutdown for %d", td->td_proc->winpid);
- ret = EIDRM;
- break;
- case WAIT_OBJECT_0 + 3: /* Signal for calling process arrived. */
- debug ("msleep process got signal for %d", td->td_proc->winpid);
- ret = EINTR;
- break;
- case WAIT_TIMEOUT:
- ret = EWOULDBLOCK;
- break;
- default:
- /* There's a chance that a process has been terminated before
- WaitForMultipleObjects has been called. In this case the handles
- might be invalid. The error code returned is ERROR_INVALID_HANDLE.
- Since we can trust the values of these handles otherwise, we
- treat an ERROR_INVALID_HANDLE as a normal process termination and
- hope for the best. */
- if (GetLastError () != ERROR_INVALID_HANDLE)
- panic ("wait in msleep (%s) failed, %lu", wmesg, GetLastError ());
- debug ("wait in msleep (%s) failed for %d, %lu", wmesg,
- td->td_proc->winpid, GetLastError ());
- ret = EIDRM;
- break;
- }
-
- msleep_sync->leave (ident);
-
- set_priority (old_priority);
-
- if (mtx && !(priority & PDROP))
- mtx_lock (mtx);
- return ret;
-}
-
-/*
- * Make all threads sleeping on the specified identifier runnable.
- */
-int
-wakeup (void *ident)
-{
- msleep_sync->wakeup (ident);
- return 0;
-}
-
-/*
- * Wakeup all sleeping threads. Only called in the context of cygserver
- * shutdown.
- */
-void
-wakeup_all (void)
-{
- SetEvent (msleep_glob_evt);
-}
-#endif /* __OUTSIDE_CYGWIN__ */