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

/* bsd_mutex.cc

   Copyright 2003, 2004, 2005, 2007 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 ());
  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, %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__ */
Commit	Line	Data
282113ba CV	1	/* bsd_mutex.cc
282113ba CV	2
7131554a	3	Copyright 2003, 2004, 2005, 2007 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)
62688407	37	panic ("couldn't allocate %s mutex, %lu\n", name, GetLastError ());
282113ba CV	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	45	if (WaitForSingleObject (m->h, INFINITE) != WAIT_OBJECT_0)
62688407 CV	46	_panic (file, line, "wait for %s in %d failed, %lu", m->name, winpid,
62688407 CV	47	GetLastError ());
282113ba	48	m->owner = winpid;
dafef5e2 CV	49	_log (file, line, LOG_DEBUG, "Locked mutex %s/%u (%u)",
dafef5e2 CV	50	m->name, ++m->cnt, winpid);
282113ba CV	51	}
	52
	53	int
dafef5e2	54	mtx_owned (mtx *m, DWORD winpid)
282113ba	55	{
dafef5e2	56	return m->owner == winpid;
282113ba CV	57	}
	58
	59	void
dafef5e2	60	_mtx_assert (mtx m, int what, DWORD winpid, const char file, int line)
282113ba CV	61	{
	62	switch (what)
	63	{
	64	case MA_OWNED:
dafef5e2	65	if (!mtx_owned (m, winpid))
96e949de	66	_panic (file, line, "Mutex %s not owned", m->name);
282113ba CV	67	break;
282113ba CV	68	case MA_NOTOWNED:
dafef5e2	69	if (mtx_owned (m, winpid))
96e949de	70	_panic (file, line, "Mutex %s is owned", m->name);
282113ba CV	71	break;
	72	default:
	73	break;
	74	}
	75	}
	76
	77	void
	78	_mtx_unlock (mtx m, const char file, int line)
	79	{
dafef5e2 CV	80	DWORD owner = m->owner;
dafef5e2 CV	81	unsigned long cnt = m->cnt;
282113ba CV	82	m->owner = 0;
	83	/* Cautiously check if mtx_destroy has been called (shutdown).
	84	In that case, m->h is NULL. */
	85	if (m->h && !ReleaseSemaphore (m->h, 1, NULL))
	86	{
7131554a CV	87	/* Check if the semaphore was already on it's max value. */
7131554a CV	88	if (GetLastError () != ERROR_TOO_MANY_POSTS)
62688407 CV	89	_panic (file, line, "release of mutex %s failed, %lu", m->name,
62688407 CV	90	GetLastError ());
282113ba	91	}
dafef5e2 CV	92	_log (file, line, LOG_DEBUG, "Unlocked mutex %s/%u (owner: %u)",
dafef5e2 CV	93	m->name, cnt, owner);
282113ba CV	94	}
	95
	96	void
	97	mtx_destroy (mtx *m)
	98	{
	99	HANDLE tmp = m->h;
	100	m->h = NULL;
	101	if (tmp)
	102	CloseHandle (tmp);
	103	}
	104
	105	/*
	106	* Helper functions for msleep/wakeup.
	107	*/
f312634c	108
282113ba CV	109	static int
	110	win_priority (int priority)
	111	{
f8e58afb	112	int p = (int)((priority) & PRIO_MASK) - PZERO;
282113ba	113	/* Generating a valid priority value is a bit tricky. The only valid
7131554a	114	values on NT4 are -15, -2, -1, 0, 1, 2, 15. */
282113ba CV	115	switch (p)
	116	{
	117	case -15: case -14: case -13: case -12: case -11:
	118	return THREAD_PRIORITY_IDLE;
	119	case -10: case -9: case -8: case -7: case -6:
	120	return THREAD_PRIORITY_LOWEST;
	121	case -5: case -4: case -3: case -2: case -1:
	122	return THREAD_PRIORITY_BELOW_NORMAL;
	123	case 0:
	124	return THREAD_PRIORITY_NORMAL;
	125	case 1: case 2: case 3: case 4: case 5:
	126	return THREAD_PRIORITY_ABOVE_NORMAL;
	127	case 6: case 7: case 8: case 9: case 10:
	128	return THREAD_PRIORITY_HIGHEST;
	129	case 11: case 12: case 13: case 14: case 15:
	130	return THREAD_PRIORITY_TIME_CRITICAL;
	131	}
	132	return THREAD_PRIORITY_NORMAL;
	133	}
	134
	135	/*
	136	* Sets the thread priority, returns the old priority.
	137	*/
	138	static int
	139	set_priority (int priority)
	140	{
	141	int old_prio = GetThreadPriority (GetCurrentThread ());
f5133f95	142	if (!SetThreadPriority (GetCurrentThread (), win_priority (priority)))
282113ba CV	143	log (LOG_WARNING,
282113ba CV	144	"Warning: Setting thread priority to %d failed with error %lu\n",
f5133f95	145	win_priority (priority), GetLastError ());
282113ba CV	146	return old_prio;
	147	}
	148
f5133f95 CV	149	/*
	150	* Original description from BSD code:
	151	*
	152	* General sleep call. Suspends the current process until a wakeup is
	153	* performed on the specified identifier. The process will then be made
	154	* runnable with the specified priority. Sleeps at most timo/hz seconds
	155	* (0 means no timeout). If pri includes PCATCH flag, signals are checked
	156	* before and after sleeping, else signals are not checked. Returns 0 if
	157	* awakened, EWOULDBLOCK if the timeout expires. If PCATCH is set and a
	158	* signal needs to be delivered, ERESTART is returned if the current system
	159	* call should be restarted if possible, and EINTR is returned if the system
	160	* call should be interrupted by the signal (return EINTR).
	161	*
	162	* The mutex argument is exited before the caller is suspended, and
	163	* entered before msleep returns. If priority includes the PDROP
	164	* flag the mutex is not entered before returning.
	165	*/
	166	static HANDLE msleep_glob_evt;
c4004194 CV	167
	168	class msleep_sync_array
	169	{
	170	enum msleep_action {
	171	MSLEEP_ENTER = 0,
	172	MSLEEP_LEAVE,
	173	MSLEEP_WAKEUP
	174	};
	175
	176	CRITICAL_SECTION cs;
	177	long cnt;
	178	long max_cnt;
	179	struct msleep_record {
	180	void *ident;
	181	HANDLE wakeup_evt;
	182	LONG threads;
	183	} *a;
	184
	185	int find_ident (void *ident, msleep_action action)
	186	{
	187	int i;
	188	for (i = 0; i < cnt; ++i)
	189	if (a[i].ident == ident)
	190	return i;
	191	if (i >= max_cnt)
	192	panic ("ident %x not found and run out of slots.", ident);
	193	if (i >= cnt && action == MSLEEP_LEAVE)
	194	panic ("ident %x not found (%d).", ident, action);
	195	return i;
	196	}
	197
	198	HANDLE first_entry (int i, void *ident)
	199	{
	200	debug ("New ident %x, index %d", ident, i);
	201	a[i].ident = ident;
	202	a[i].wakeup_evt = CreateEvent (NULL, TRUE, FALSE, NULL);
	203	if (!a[i].wakeup_evt)
62688407	204	panic ("CreateEvent failed: %lu", GetLastError ());
c4004194 CV	205	debug ("i = %d, CreateEvent: %x", i, a[i].wakeup_evt);
	206	a[i].threads = 1;
	207	++cnt;
	208	return a[i].wakeup_evt;
	209	}
	210
	211	HANDLE next_entry (int i)
	212	{
	213	if (a[i].ident && WaitForSingleObject (a[i].wakeup_evt, 0) != WAIT_OBJECT_0)
	214	{
	215	++a[i].threads;
	216	return a[i].wakeup_evt;
	217	}
	218	return NULL;
	219	}
	220
	221	public:
	222
	223	msleep_sync_array (int count) : cnt (0), max_cnt (count)
	224	{
	225	InitializeCriticalSection (&cs);
	226	if (!(a = new msleep_record[count]))
	227	panic ("Allocating msleep records failed: %d", errno);
	228	}
	229
	230	HANDLE enter (void *ident)
	231	{
	232	HANDLE evt = NULL;
	233	while (!evt)
	234	{
	235	EnterCriticalSection (&cs);
	236	int i = find_ident (ident, MSLEEP_ENTER);
	237	if (i >= cnt)
	238	evt = first_entry (i, ident);
	239	else if (!(evt = next_entry (i)))
	240	{
	241	/* wakeup has been called, so sleep to wait until all
	242	formerly waiting threads have left and retry. */
	243	LeaveCriticalSection (&cs);
	244	Sleep (1L);
	245	}
	246	}
	247	LeaveCriticalSection (&cs);
	248	return evt;
	249	}
	250
	251	void leave (void *ident)
	252	{
	253	EnterCriticalSection (&cs);
	254	int i = find_ident (ident, MSLEEP_LEAVE);
	255	if (--a[i].threads == 0)
	256	{
	257	debug ("i = %d, CloseEvent: %x", i, a[i].wakeup_evt);
	258	CloseHandle (a[i].wakeup_evt);
	259	a[i].ident = NULL;
	260	--cnt;
	261	if (i < cnt)
	262	a[i] = a[cnt];
	263	}
	264	LeaveCriticalSection (&cs);
	265	}
	266
	267	void wakeup (void *ident)
	268	{
269	EnterCriticalSection (&cs);
270	int i = find_ident (ident, MSLEEP_WAKEUP);
271	if (i < cnt && a[i].ident)
272	SetEvent (a[i].wakeup_evt);
273	LeaveCriticalSection (&cs);
274	}
275	};
276
277	static msleep_sync_array *msleep_sync;
f5133f95 CV	278
	279	void
	280	msleep_init (void)
	281	{
dafef5e2 CV	282	extern struct msginfo msginfo;
	283	extern struct seminfo seminfo;
	284
f5133f95 CV	285	msleep_glob_evt = CreateEvent (NULL, TRUE, FALSE, NULL);
f5133f95 CV	286	if (!msleep_glob_evt)
62688407	287	panic ("CreateEvent in msleep_init failed: %lu", GetLastError ());
dafef5e2 CV	288	long msgmni = support_msgqueues ? msginfo.msgmni : 0;
	289	long semmni = support_semaphores ? seminfo.semmni : 0;
	290	TUNABLE_INT_FETCH ("kern.ipc.msgmni", &msgmni);
	291	TUNABLE_INT_FETCH ("kern.ipc.semmni", &semmni);
	292	debug ("Try allocating msgmni (%d) + semmni (%d) msleep records",
	293	msgmni, semmni);
c4004194 CV	294	msleep_sync = new msleep_sync_array (msgmni + semmni);
c4004194 CV	295	if (!msleep_sync)
dafef5e2	296	panic ("Allocating msleep records in msleep_init failed: %d", errno);
f5133f95 CV	297	}
f5133f95 CV	298
282113ba CV	299	int
	300	_msleep (void ident, struct mtx mtx, int priority,
	301	const char wmesg, int timo, struct thread td)
	302	{
	303	int ret = -1;
f312634c	304
c4004194	305	HANDLE evt = msleep_sync->enter (ident);
f312634c	306
282113ba CV	307	if (mtx)
	308	mtx_unlock (mtx);
	309	int old_priority = set_priority (priority);
f5133f95 CV	310	HANDLE obj[4] =
f5133f95 CV	311	{
c4004194	312	evt,
f5133f95 CV	313	msleep_glob_evt,
	314	td->client->handle (),
	315	td->client->signal_arrived ()
	316	};
373a036f CV	317	/* PCATCH handling. If PCATCH is given and signal_arrived is a valid
	318	handle, then it's used in the WaitFor call and EINTR is returned. */
	319	int obj_cnt = 3;
	320	if ((priority & PCATCH)
	321	&& td->client->signal_arrived () != INVALID_HANDLE_VALUE)
	322	obj_cnt = 4;
	323	switch (WaitForMultipleObjects (obj_cnt, obj, FALSE, timo ?: INFINITE))
282113ba CV	324	{
	325	case WAIT_OBJECT_0: /* wakeup() has been called. */
	326	ret = 0;
c4004194	327	debug ("msleep wakeup called for %d", td->td_proc->winpid);
282113ba	328	break;
f5133f95	329	case WAIT_OBJECT_0 + 1: /* Shutdown event (triggered by wakeup_all). */
282113ba CV	330	priority \|= PDROP;
282113ba CV	331	/FALLTHRU/
f5133f95	332	case WAIT_OBJECT_0 + 2: /* The dependent process has exited. */
c4004194	333	debug ("msleep process exit or shutdown for %d", td->td_proc->winpid);
282113ba CV	334	ret = EIDRM;
282113ba CV	335	break;
373a036f	336	case WAIT_OBJECT_0 + 3: /* Signal for calling process arrived. */
c4004194	337	debug ("msleep process got signal for %d", td->td_proc->winpid);
373a036f CV	338	ret = EINTR;
373a036f CV	339	break;
282113ba CV	340	case WAIT_TIMEOUT:
	341	ret = EWOULDBLOCK;
	342	break;
	343	default:
dafef5e2 CV	344	/* There's a chance that a process has been terminated before
	345	WaitForMultipleObjects has been called. In this case the handles
	346	might be invalid. The error code returned is ERROR_INVALID_HANDLE.
	347	Since we can trust the values of these handles otherwise, we
	348	treat an ERROR_INVALID_HANDLE as a normal process termination and
	349	hope for the best. */
	350	if (GetLastError () != ERROR_INVALID_HANDLE)
62688407 CV	351	panic ("wait in msleep (%s) failed, %lu", wmesg, GetLastError ());
	352	debug ("wait in msleep (%s) failed for %d, %lu", wmesg,
	353	td->td_proc->winpid, GetLastError ());
dafef5e2	354	ret = EIDRM;
282113ba CV	355	break;
282113ba CV	356	}
f312634c	357
c4004194	358	msleep_sync->leave (ident);
f312634c	359
282113ba	360	set_priority (old_priority);
f312634c	361
a9185492	362	if (mtx && !(priority & PDROP))
282113ba	363	mtx_lock (mtx);
282113ba CV	364	return ret;
	365	}
	366
	367	/*
	368	* Make all threads sleeping on the specified identifier runnable.
	369	*/
	370	int
	371	wakeup (void *ident)
	372	{
c4004194	373	msleep_sync->wakeup (ident);
282113ba CV	374	return 0;
	375	}
	376
	377	/*
	378	* Wakeup all sleeping threads. Only called in the context of cygserver
	379	* shutdown.
	380	*/
	381	void
	382	wakeup_all (void)
	383	{
c4004194	384	SetEvent (msleep_glob_evt);
282113ba CV	385	}
282113ba CV	386	#endif /* __OUTSIDE_CYGWIN__ */