[newlib-cygwin.git] / winsup / cygserver / bsd_mutex.cc

/* bsd_mutex.cc

   Copyright 2003, 2004, 2005 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, %E\n", name);
}

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, %E", m->name, winpid);
  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.  In this case,
         ReleaseSemaphore returns FALSE with an error code which *sic* depends
	 on the OS. */
      if (  (!wincap.is_winnt () && GetLastError () != ERROR_INVALID_PARAMETER)
          || (wincap.is_winnt () && GetLastError () != ERROR_TOO_MANY_POSTS))
	_panic (file, line, "release of mutex %s failed, %E", m->name);
    }
  _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 9x and 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: %E");
    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: %E");
  long msgmni = support_msgqueues ? msginfo.msgmni : 0;
  long 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, %E", wmesg);
	debug ("wait in msleep (%s) failed for %d, %E", wmesg,
							td->td_proc->winpid);
	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__ */
Commit	Line	Data
282113ba CV	1	/* bsd_mutex.cc
282113ba CV	2
c9f545e2	3	Copyright 2003, 2004, 2005 Red Hat Inc.
282113ba CV	4
	5	This file is part of Cygwin.
	6
	7	This software is a copyrighted work licensed under the terms of the
	8	Cygwin license. Please consult the file "CYGWIN_LICENSE" for
	9	details. */
	10	#ifdef __OUTSIDE_CYGWIN__
	11	#include "woutsup.h"
1dcd520b	12	#include <errno.h>
282113ba CV	13	#define _KERNEL 1
	14	#define __BSD_VISIBLE 1
	15	#include <sys/smallprint.h>
f312634c	16	#include <limits.h>
dafef5e2 CV	17	#include <stdlib.h>
	18	#include <sys/msg.h>
	19	#include <sys/sem.h>
282113ba CV	20
	21	#include "process.h"
	22	#include "cygserver_ipc.h"
	23
	24	/* A BSD kernel global mutex. */
	25	struct mtx Giant;
	26
	27	void
	28	mtx_init (mtx m, const char name, const void *, int)
	29	{
	30	m->name = name;
	31	m->owner = 0;
dafef5e2	32	m->cnt = 0;
282113ba CV	33	/* Can't use Windows Mutexes here since Windows Mutexes are only
	34	unlockable by the lock owner. */
	35	m->h = CreateSemaphore (NULL, 1, 1, NULL);
	36	if (!m->h)
	37	panic ("couldn't allocate %s mutex, %E\n", name);
	38	}
	39
	40	void
	41	_mtx_lock (mtx m, DWORD winpid, const char file, int line)
	42	{
dafef5e2 CV	43	_log (file, line, LOG_DEBUG, "Try locking mutex %s (%u) (hold: %u)",
dafef5e2 CV	44	m->name, winpid, m->owner);
282113ba CV	45	if (WaitForSingleObject (m->h, INFINITE) != WAIT_OBJECT_0)
	46	_panic (file, line, "wait for %s in %d failed, %E", m->name, winpid);
	47	m->owner = winpid;
dafef5e2 CV	48	_log (file, line, LOG_DEBUG, "Locked mutex %s/%u (%u)",
dafef5e2 CV	49	m->name, ++m->cnt, winpid);
282113ba CV	50	}
	51
	52	int
dafef5e2	53	mtx_owned (mtx *m, DWORD winpid)
282113ba	54	{
dafef5e2	55	return m->owner == winpid;
282113ba CV	56	}
	57
	58	void
dafef5e2	59	_mtx_assert (mtx m, int what, DWORD winpid, const char file, int line)
282113ba CV	60	{
	61	switch (what)
	62	{
	63	case MA_OWNED:
dafef5e2	64	if (!mtx_owned (m, winpid))
96e949de	65	_panic (file, line, "Mutex %s not owned", m->name);
282113ba CV	66	break;
282113ba CV	67	case MA_NOTOWNED:
dafef5e2	68	if (mtx_owned (m, winpid))
96e949de	69	_panic (file, line, "Mutex %s is owned", m->name);
282113ba CV	70	break;
	71	default:
	72	break;
	73	}
	74	}
	75
	76	void
	77	_mtx_unlock (mtx m, const char file, int line)
	78	{
dafef5e2 CV	79	DWORD owner = m->owner;
dafef5e2 CV	80	unsigned long cnt = m->cnt;
282113ba CV	81	m->owner = 0;
	82	/* Cautiously check if mtx_destroy has been called (shutdown).
	83	In that case, m->h is NULL. */
	84	if (m->h && !ReleaseSemaphore (m->h, 1, NULL))
	85	{
	86	/* Check if the semaphore was already on it's max value. In this case,
	87	ReleaseSemaphore returns FALSE with an error code which sic depends
	88	on the OS. */
	89	if ( (!wincap.is_winnt () && GetLastError () != ERROR_INVALID_PARAMETER)
	90	\|\| (wincap.is_winnt () && GetLastError () != ERROR_TOO_MANY_POSTS))
	91	_panic (file, line, "release of mutex %s failed, %E", m->name);
	92	}
dafef5e2 CV	93	_log (file, line, LOG_DEBUG, "Unlocked mutex %s/%u (owner: %u)",
dafef5e2 CV	94	m->name, cnt, owner);
282113ba CV	95	}
	96
	97	void
	98	mtx_destroy (mtx *m)
	99	{
	100	HANDLE tmp = m->h;
	101	m->h = NULL;
	102	if (tmp)
	103	CloseHandle (tmp);
	104	}
	105
	106	/*
	107	* Helper functions for msleep/wakeup.
	108	*/
f312634c	109
282113ba CV	110	static int
	111	win_priority (int priority)
	112	{
f8e58afb	113	int p = (int)((priority) & PRIO_MASK) - PZERO;
282113ba CV	114	/* Generating a valid priority value is a bit tricky. The only valid
	115	values on 9x and NT4 are -15, -2, -1, 0, 1, 2, 15. */
	116	switch (p)
	117	{
	118	case -15: case -14: case -13: case -12: case -11:
	119	return THREAD_PRIORITY_IDLE;
	120	case -10: case -9: case -8: case -7: case -6:
	121	return THREAD_PRIORITY_LOWEST;
	122	case -5: case -4: case -3: case -2: case -1:
	123	return THREAD_PRIORITY_BELOW_NORMAL;
	124	case 0:
	125	return THREAD_PRIORITY_NORMAL;
	126	case 1: case 2: case 3: case 4: case 5:
	127	return THREAD_PRIORITY_ABOVE_NORMAL;
	128	case 6: case 7: case 8: case 9: case 10:
	129	return THREAD_PRIORITY_HIGHEST;
	130	case 11: case 12: case 13: case 14: case 15:
	131	return THREAD_PRIORITY_TIME_CRITICAL;
	132	}
	133	return THREAD_PRIORITY_NORMAL;
	134	}
	135
	136	/*
	137	* Sets the thread priority, returns the old priority.
	138	*/
	139	static int
	140	set_priority (int priority)
	141	{
	142	int old_prio = GetThreadPriority (GetCurrentThread ());
f5133f95	143	if (!SetThreadPriority (GetCurrentThread (), win_priority (priority)))
282113ba CV	144	log (LOG_WARNING,
282113ba CV	145	"Warning: Setting thread priority to %d failed with error %lu\n",
f5133f95	146	win_priority (priority), GetLastError ());
282113ba CV	147	return old_prio;
	148	}
	149
f5133f95 CV	150	/*
	151	* Original description from BSD code:
	152	*
	153	* General sleep call. Suspends the current process until a wakeup is
	154	* performed on the specified identifier. The process will then be made
	155	* runnable with the specified priority. Sleeps at most timo/hz seconds
	156	* (0 means no timeout). If pri includes PCATCH flag, signals are checked
	157	* before and after sleeping, else signals are not checked. Returns 0 if
	158	* awakened, EWOULDBLOCK if the timeout expires. If PCATCH is set and a
	159	* signal needs to be delivered, ERESTART is returned if the current system
	160	* call should be restarted if possible, and EINTR is returned if the system
	161	* call should be interrupted by the signal (return EINTR).
	162	*
	163	* The mutex argument is exited before the caller is suspended, and
	164	* entered before msleep returns. If priority includes the PDROP
	165	* flag the mutex is not entered before returning.
	166	*/
	167	static HANDLE msleep_glob_evt;
c4004194 CV	168
	169	class msleep_sync_array
	170	{
	171	enum msleep_action {
	172	MSLEEP_ENTER = 0,
	173	MSLEEP_LEAVE,
	174	MSLEEP_WAKEUP
	175	};
	176
	177	CRITICAL_SECTION cs;
	178	long cnt;
	179	long max_cnt;
	180	struct msleep_record {
	181	void *ident;
	182	HANDLE wakeup_evt;
	183	LONG threads;
	184	} *a;
	185
	186	int find_ident (void *ident, msleep_action action)
	187	{
	188	int i;
	189	for (i = 0; i < cnt; ++i)
	190	if (a[i].ident == ident)
	191	return i;
	192	if (i >= max_cnt)
	193	panic ("ident %x not found and run out of slots.", ident);
	194	if (i >= cnt && action == MSLEEP_LEAVE)
	195	panic ("ident %x not found (%d).", ident, action);
	196	return i;
	197	}
	198
	199	HANDLE first_entry (int i, void *ident)
	200	{
	201	debug ("New ident %x, index %d", ident, i);
	202	a[i].ident = ident;
	203	a[i].wakeup_evt = CreateEvent (NULL, TRUE, FALSE, NULL);
	204	if (!a[i].wakeup_evt)
	205	panic ("CreateEvent failed: %E");
	206	debug ("i = %d, CreateEvent: %x", i, a[i].wakeup_evt);
	207	a[i].threads = 1;
	208	++cnt;
	209	return a[i].wakeup_evt;
	210	}
	211
	212	HANDLE next_entry (int i)
	213	{
	214	if (a[i].ident && WaitForSingleObject (a[i].wakeup_evt, 0) != WAIT_OBJECT_0)
	215	{
	216	++a[i].threads;
	217	return a[i].wakeup_evt;
	218	}
	219	return NULL;
	220	}
	221
	222	public:
	223
	224	msleep_sync_array (int count) : cnt (0), max_cnt (count)
	225	{
	226	InitializeCriticalSection (&cs);
	227	if (!(a = new msleep_record[count]))
	228	panic ("Allocating msleep records failed: %d", errno);
	229	}
	230
	231	HANDLE enter (void *ident)
232	{
233	HANDLE evt = NULL;
234	while (!evt)
235	{
236	EnterCriticalSection (&cs);
237	int i = find_ident (ident, MSLEEP_ENTER);
238	if (i >= cnt)
239	evt = first_entry (i, ident);
240	else if (!(evt = next_entry (i)))
241	{
242	/* wakeup has been called, so sleep to wait until all
243	formerly waiting threads have left and retry. */
244	LeaveCriticalSection (&cs);
245	Sleep (1L);
246	}
247	}
248	LeaveCriticalSection (&cs);
249	return evt;
250	}
251
252	void leave (void *ident)
253	{
254	EnterCriticalSection (&cs);
255	int i = find_ident (ident, MSLEEP_LEAVE);
256	if (--a[i].threads == 0)
257	{
258	debug ("i = %d, CloseEvent: %x", i, a[i].wakeup_evt);
259	CloseHandle (a[i].wakeup_evt);
260	a[i].ident = NULL;
261	--cnt;
262	if (i < cnt)
263	a[i] = a[cnt];
264	}
265	LeaveCriticalSection (&cs);
266	}
267
268	void wakeup (void *ident)
269	{
270	EnterCriticalSection (&cs);
271	int i = find_ident (ident, MSLEEP_WAKEUP);
272	if (i < cnt && a[i].ident)
273	SetEvent (a[i].wakeup_evt);
274	LeaveCriticalSection (&cs);
275	}
276	};
277
278	static msleep_sync_array *msleep_sync;
f5133f95 CV	279
	280	void
	281	msleep_init (void)
	282	{
dafef5e2 CV	283	extern struct msginfo msginfo;
	284	extern struct seminfo seminfo;
	285
f5133f95 CV	286	msleep_glob_evt = CreateEvent (NULL, TRUE, FALSE, NULL);
	287	if (!msleep_glob_evt)
	288	panic ("CreateEvent in msleep_init failed: %E");
dafef5e2 CV	289	long msgmni = support_msgqueues ? msginfo.msgmni : 0;
	290	long semmni = support_semaphores ? seminfo.semmni : 0;
	291	TUNABLE_INT_FETCH ("kern.ipc.msgmni", &msgmni);
	292	TUNABLE_INT_FETCH ("kern.ipc.semmni", &semmni);
	293	debug ("Try allocating msgmni (%d) + semmni (%d) msleep records",
	294	msgmni, semmni);
c4004194 CV	295	msleep_sync = new msleep_sync_array (msgmni + semmni);
c4004194 CV	296	if (!msleep_sync)
dafef5e2	297	panic ("Allocating msleep records in msleep_init failed: %d", errno);
f5133f95 CV	298	}
f5133f95 CV	299
282113ba CV	300	int
	301	_msleep (void ident, struct mtx mtx, int priority,
	302	const char wmesg, int timo, struct thread td)
	303	{
	304	int ret = -1;
f312634c	305
c4004194	306	HANDLE evt = msleep_sync->enter (ident);
f312634c	307
282113ba CV	308	if (mtx)
	309	mtx_unlock (mtx);
	310	int old_priority = set_priority (priority);
f5133f95 CV	311	HANDLE obj[4] =
f5133f95 CV	312	{
c4004194	313	evt,
f5133f95 CV	314	msleep_glob_evt,
	315	td->client->handle (),
	316	td->client->signal_arrived ()
	317	};
373a036f CV	318	/* PCATCH handling. If PCATCH is given and signal_arrived is a valid
	319	handle, then it's used in the WaitFor call and EINTR is returned. */
	320	int obj_cnt = 3;
	321	if ((priority & PCATCH)
	322	&& td->client->signal_arrived () != INVALID_HANDLE_VALUE)
	323	obj_cnt = 4;
	324	switch (WaitForMultipleObjects (obj_cnt, obj, FALSE, timo ?: INFINITE))
282113ba CV	325	{
	326	case WAIT_OBJECT_0: /* wakeup() has been called. */
	327	ret = 0;
c4004194	328	debug ("msleep wakeup called for %d", td->td_proc->winpid);
282113ba	329	break;
f5133f95	330	case WAIT_OBJECT_0 + 1: /* Shutdown event (triggered by wakeup_all). */
282113ba CV	331	priority \|= PDROP;
282113ba CV	332	/FALLTHRU/
f5133f95	333	case WAIT_OBJECT_0 + 2: /* The dependent process has exited. */
c4004194	334	debug ("msleep process exit or shutdown for %d", td->td_proc->winpid);
282113ba CV	335	ret = EIDRM;
282113ba CV	336	break;
373a036f	337	case WAIT_OBJECT_0 + 3: /* Signal for calling process arrived. */
c4004194	338	debug ("msleep process got signal for %d", td->td_proc->winpid);
373a036f CV	339	ret = EINTR;
373a036f CV	340	break;
282113ba CV	341	case WAIT_TIMEOUT:
	342	ret = EWOULDBLOCK;
	343	break;
	344	default:
dafef5e2 CV	345	/* There's a chance that a process has been terminated before
	346	WaitForMultipleObjects has been called. In this case the handles
	347	might be invalid. The error code returned is ERROR_INVALID_HANDLE.
	348	Since we can trust the values of these handles otherwise, we
	349	treat an ERROR_INVALID_HANDLE as a normal process termination and
	350	hope for the best. */
	351	if (GetLastError () != ERROR_INVALID_HANDLE)
	352	panic ("wait in msleep (%s) failed, %E", wmesg);
c4004194 CV	353	debug ("wait in msleep (%s) failed for %d, %E", wmesg,
c4004194 CV	354	td->td_proc->winpid);
dafef5e2	355	ret = EIDRM;
282113ba CV	356	break;
282113ba CV	357	}
f312634c	358
c4004194	359	msleep_sync->leave (ident);
f312634c	360
282113ba	361	set_priority (old_priority);
f312634c	362
a9185492	363	if (mtx && !(priority & PDROP))
282113ba	364	mtx_lock (mtx);
282113ba CV	365	return ret;
	366	}
	367
	368	/*
	369	* Make all threads sleeping on the specified identifier runnable.
	370	*/
	371	int
	372	wakeup (void *ident)
	373	{
c4004194	374	msleep_sync->wakeup (ident);
282113ba CV	375	return 0;
	376	}
	377
	378	/*
	379	* Wakeup all sleeping threads. Only called in the context of cygserver
	380	* shutdown.
	381	*/
	382	void
	383	wakeup_all (void)
	384	{
c4004194	385	SetEvent (msleep_glob_evt);
282113ba CV	386	}
282113ba CV	387	#endif /* __OUTSIDE_CYGWIN__ */