1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
|
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#if defined(_PPRMWAIT_H)
#else
#define _PPRMWAIT_H
#include "prlock.h"
#include "prcvar.h"
#include "prclist.h"
#include "prthread.h"
#define MAX_POLLING_INTERVAL 100
#define _PR_POLL_COUNT_FUDGE 64
#define _PR_DEFAULT_HASH_LENGTH 59
/*
* Our hash table resolves collisions by open addressing with
* double hashing. See Cormen, Leiserson, and Rivest,
* Introduction to Algorithms, p. 232, The MIT Press, 1990.
*/
#define _MW_HASH(a, m) ((((PRUptrdiff)(a) >> 4) ^ ((PRUptrdiff)(a) >> 10)) % (m))
#define _MW_HASH2(a, m) (1 + ((((PRUptrdiff)(a) >> 4) ^ ((PRUptrdiff)(a) >> 10)) % (m - 2)))
#define _MW_ABORTED(_rv) \
((PR_FAILURE == (_rv)) && (PR_PENDING_INTERRUPT_ERROR == PR_GetError()))
typedef enum {_prmw_success, _prmw_rehash, _prmw_error} _PR_HashStory;
typedef struct _PRWaiterHash
{
PRUint16 count; /* current number in hash table */
PRUint16 length; /* current size of the hash table */
PRRecvWait *recv_wait; /* hash table of receive wait objects */
} _PRWaiterHash;
typedef enum {_prmw_running, _prmw_stopping, _prmw_stopped} PRMWGroupState;
struct PRWaitGroup
{
PRCList group_link; /* all groups are linked to each other */
PRCList io_ready; /* list of I/O requests that are ready */
PRMWGroupState state; /* state of this group (so we can shut down) */
PRLock *ml; /* lock for synchronizing this wait group */
PRCondVar *io_taken; /* calling threads notify when they take I/O */
PRCondVar *io_complete; /* calling threads wait here for completions */
PRCondVar *new_business; /* polling thread waits here more work */
PRCondVar *mw_manage; /* used to manage group lists */
PRThread* poller; /* thread that's actually doing the poll() */
PRUint16 waiting_threads; /* number of threads waiting for recv */
PRUint16 polling_count; /* number of elements in the polling list */
PRUint32 p_timestamp; /* pseudo-time group had element removed */
PRPollDesc *polling_list; /* list poller builds for polling */
PRIntervalTime last_poll; /* last time we polled */
_PRWaiterHash *waiter; /* pointer to hash table of wait receive objects */
#ifdef WINNT
/*
* On NT, idle threads are responsible for getting completed i/o.
* They need to add completed i/o to the io_ready list. Since
* idle threads cannot use nspr locks, we have to use an md lock
* to protect the io_ready list.
*/
_MDLock mdlock; /* protect io_ready, waiter, and wait_list */
PRCList wait_list; /* used in place of io_complete. reuse
* waitQLinks in the PRThread structure. */
#endif /* WINNT */
};
/**********************************************************************
***********************************************************************
******************** Wait group enumerations **************************
***********************************************************************
**********************************************************************/
typedef struct _PRGlobalState
{
PRCList group_list; /* master of the group list */
PRWaitGroup *group; /* the default (NULL) group */
} _PRGlobalState;
#ifdef WINNT
extern PRStatus NT_HashRemoveInternal(PRWaitGroup *group, PRFileDesc *fd);
#endif
typedef enum {_PR_ENUM_UNSEALED=0, _PR_ENUM_SEALED=0x0eadface} _PREnumSeal;
struct PRMWaitEnumerator
{
PRWaitGroup *group; /* group this enumerator is bound to */
PRThread *thread; /* thread in midst of an enumeration */
_PREnumSeal seal; /* trying to detect deleted objects */
PRUint32 p_timestamp; /* when enumeration was (re)started */
PRRecvWait **waiter; /* pointer into hash table */
PRUintn index; /* position in hash table */
void *pad[4]; /* some room to grow */
};
#endif /* defined(_PPRMWAIT_H) */
/* pprmwait.h */
|
