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annotate nspr/pr/include/private/pprmwait.h @ 4:b513267f632f tip

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Build DBM module
author Andre Heinecke <andre.heinecke@intevation.de>
date Tue, 05 Aug 2014 18:58:03 +0200
parents 1e5118fa0cb1
children
rev   line source
0
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1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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2 /* This Source Code Form is subject to the terms of the Mozilla Public
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3 * License, v. 2.0. If a copy of the MPL was not distributed with this
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4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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5
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6 #if defined(_PPRMWAIT_H)
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7 #else
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8 #define _PPRMWAIT_H
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9
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10 #include "prlock.h"
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11 #include "prcvar.h"
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12 #include "prclist.h"
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13 #include "prthread.h"
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14
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15 #define MAX_POLLING_INTERVAL 100
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16 #define _PR_POLL_COUNT_FUDGE 64
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17 #define _PR_DEFAULT_HASH_LENGTH 59
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18
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19 /*
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20 * Our hash table resolves collisions by open addressing with
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21 * double hashing. See Cormen, Leiserson, and Rivest,
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22 * Introduction to Algorithms, p. 232, The MIT Press, 1990.
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23 */
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24
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25 #define _MW_HASH(a, m) ((((PRUptrdiff)(a) >> 4) ^ ((PRUptrdiff)(a) >> 10)) % (m))
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26 #define _MW_HASH2(a, m) (1 + ((((PRUptrdiff)(a) >> 4) ^ ((PRUptrdiff)(a) >> 10)) % (m - 2)))
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27 #define _MW_ABORTED(_rv) \
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28 ((PR_FAILURE == (_rv)) && (PR_PENDING_INTERRUPT_ERROR == PR_GetError()))
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29
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30 typedef enum {_prmw_success, _prmw_rehash, _prmw_error} _PR_HashStory;
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31
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32 typedef struct _PRWaiterHash
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33 {
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34 PRUint16 count; /* current number in hash table */
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35 PRUint16 length; /* current size of the hash table */
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36 PRRecvWait *recv_wait; /* hash table of receive wait objects */
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37 } _PRWaiterHash;
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38
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39 typedef enum {_prmw_running, _prmw_stopping, _prmw_stopped} PRMWGroupState;
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40
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41 struct PRWaitGroup
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42 {
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43 PRCList group_link; /* all groups are linked to each other */
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44 PRCList io_ready; /* list of I/O requests that are ready */
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45 PRMWGroupState state; /* state of this group (so we can shut down) */
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46
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47 PRLock *ml; /* lock for synchronizing this wait group */
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48 PRCondVar *io_taken; /* calling threads notify when they take I/O */
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49 PRCondVar *io_complete; /* calling threads wait here for completions */
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50 PRCondVar *new_business; /* polling thread waits here more work */
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51 PRCondVar *mw_manage; /* used to manage group lists */
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52 PRThread* poller; /* thread that's actually doing the poll() */
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53 PRUint16 waiting_threads; /* number of threads waiting for recv */
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54 PRUint16 polling_count; /* number of elements in the polling list */
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55 PRUint32 p_timestamp; /* pseudo-time group had element removed */
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56 PRPollDesc *polling_list; /* list poller builds for polling */
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57 PRIntervalTime last_poll; /* last time we polled */
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58 _PRWaiterHash *waiter; /* pointer to hash table of wait receive objects */
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59
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60 #ifdef WINNT
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61 /*
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62 * On NT, idle threads are responsible for getting completed i/o.
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63 * They need to add completed i/o to the io_ready list. Since
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64 * idle threads cannot use nspr locks, we have to use an md lock
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65 * to protect the io_ready list.
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66 */
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67 _MDLock mdlock; /* protect io_ready, waiter, and wait_list */
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68 PRCList wait_list; /* used in place of io_complete. reuse
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69 * waitQLinks in the PRThread structure. */
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70 #endif /* WINNT */
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71 };
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72
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73 /**********************************************************************
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74 ***********************************************************************
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75 ******************** Wait group enumerations **************************
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76 ***********************************************************************
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77 **********************************************************************/
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78 typedef struct _PRGlobalState
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79 {
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80 PRCList group_list; /* master of the group list */
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81 PRWaitGroup *group; /* the default (NULL) group */
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82 } _PRGlobalState;
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83
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84 #ifdef WINNT
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85 extern PRStatus NT_HashRemoveInternal(PRWaitGroup *group, PRFileDesc *fd);
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86 #endif
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87
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88 typedef enum {_PR_ENUM_UNSEALED=0, _PR_ENUM_SEALED=0x0eadface} _PREnumSeal;
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89
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90 struct PRMWaitEnumerator
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91 {
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92 PRWaitGroup *group; /* group this enumerator is bound to */
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93 PRThread *thread; /* thread in midst of an enumeration */
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94 _PREnumSeal seal; /* trying to detect deleted objects */
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95 PRUint32 p_timestamp; /* when enumeration was (re)started */
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96 PRRecvWait **waiter; /* pointer into hash table */
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97 PRUintn index; /* position in hash table */
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98 void *pad[4]; /* some room to grow */
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99 };
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100
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101 #endif /* defined(_PPRMWAIT_H) */
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102
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103 /* pprmwait.h */
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