1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/nsprpub/pr/include/private/pprmwait.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,103 @@
1.4 +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +#if defined(_PPRMWAIT_H)
1.10 +#else
1.11 +#define _PPRMWAIT_H
1.12 +
1.13 +#include "prlock.h"
1.14 +#include "prcvar.h"
1.15 +#include "prclist.h"
1.16 +#include "prthread.h"
1.17 +
1.18 +#define MAX_POLLING_INTERVAL 100
1.19 +#define _PR_POLL_COUNT_FUDGE 64
1.20 +#define _PR_DEFAULT_HASH_LENGTH 59
1.21 +
1.22 +/*
1.23 + * Our hash table resolves collisions by open addressing with
1.24 + * double hashing. See Cormen, Leiserson, and Rivest,
1.25 + * Introduction to Algorithms, p. 232, The MIT Press, 1990.
1.26 + */
1.27 +
1.28 +#define _MW_HASH(a, m) ((((PRUptrdiff)(a) >> 4) ^ ((PRUptrdiff)(a) >> 10)) % (m))
1.29 +#define _MW_HASH2(a, m) (1 + ((((PRUptrdiff)(a) >> 4) ^ ((PRUptrdiff)(a) >> 10)) % (m - 2)))
1.30 +#define _MW_ABORTED(_rv) \
1.31 + ((PR_FAILURE == (_rv)) && (PR_PENDING_INTERRUPT_ERROR == PR_GetError()))
1.32 +
1.33 +typedef enum {_prmw_success, _prmw_rehash, _prmw_error} _PR_HashStory;
1.34 +
1.35 +typedef struct _PRWaiterHash
1.36 +{
1.37 + PRUint16 count; /* current number in hash table */
1.38 + PRUint16 length; /* current size of the hash table */
1.39 + PRRecvWait *recv_wait; /* hash table of receive wait objects */
1.40 +} _PRWaiterHash;
1.41 +
1.42 +typedef enum {_prmw_running, _prmw_stopping, _prmw_stopped} PRMWGroupState;
1.43 +
1.44 +struct PRWaitGroup
1.45 +{
1.46 + PRCList group_link; /* all groups are linked to each other */
1.47 + PRCList io_ready; /* list of I/O requests that are ready */
1.48 + PRMWGroupState state; /* state of this group (so we can shut down) */
1.49 +
1.50 + PRLock *ml; /* lock for synchronizing this wait group */
1.51 + PRCondVar *io_taken; /* calling threads notify when they take I/O */
1.52 + PRCondVar *io_complete; /* calling threads wait here for completions */
1.53 + PRCondVar *new_business; /* polling thread waits here more work */
1.54 + PRCondVar *mw_manage; /* used to manage group lists */
1.55 + PRThread* poller; /* thread that's actually doing the poll() */
1.56 + PRUint16 waiting_threads; /* number of threads waiting for recv */
1.57 + PRUint16 polling_count; /* number of elements in the polling list */
1.58 + PRUint32 p_timestamp; /* pseudo-time group had element removed */
1.59 + PRPollDesc *polling_list; /* list poller builds for polling */
1.60 + PRIntervalTime last_poll; /* last time we polled */
1.61 + _PRWaiterHash *waiter; /* pointer to hash table of wait receive objects */
1.62 +
1.63 +#ifdef WINNT
1.64 + /*
1.65 + * On NT, idle threads are responsible for getting completed i/o.
1.66 + * They need to add completed i/o to the io_ready list. Since
1.67 + * idle threads cannot use nspr locks, we have to use an md lock
1.68 + * to protect the io_ready list.
1.69 + */
1.70 + _MDLock mdlock; /* protect io_ready, waiter, and wait_list */
1.71 + PRCList wait_list; /* used in place of io_complete. reuse
1.72 + * waitQLinks in the PRThread structure. */
1.73 +#endif /* WINNT */
1.74 +};
1.75 +
1.76 +/**********************************************************************
1.77 +***********************************************************************
1.78 +******************** Wait group enumerations **************************
1.79 +***********************************************************************
1.80 +**********************************************************************/
1.81 +typedef struct _PRGlobalState
1.82 +{
1.83 + PRCList group_list; /* master of the group list */
1.84 + PRWaitGroup *group; /* the default (NULL) group */
1.85 +} _PRGlobalState;
1.86 +
1.87 +#ifdef WINNT
1.88 +extern PRStatus NT_HashRemoveInternal(PRWaitGroup *group, PRFileDesc *fd);
1.89 +#endif
1.90 +
1.91 +typedef enum {_PR_ENUM_UNSEALED=0, _PR_ENUM_SEALED=0x0eadface} _PREnumSeal;
1.92 +
1.93 +struct PRMWaitEnumerator
1.94 +{
1.95 + PRWaitGroup *group; /* group this enumerator is bound to */
1.96 + PRThread *thread; /* thread in midst of an enumeration */
1.97 + _PREnumSeal seal; /* trying to detect deleted objects */
1.98 + PRUint32 p_timestamp; /* when enumeration was (re)started */
1.99 + PRRecvWait **waiter; /* pointer into hash table */
1.100 + PRUintn index; /* position in hash table */
1.101 + void *pad[4]; /* some room to grow */
1.102 +};
1.103 +
1.104 +#endif /* defined(_PPRMWAIT_H) */
1.105 +
1.106 +/* pprmwait.h */
