diff options
Diffstat (limited to 'nsprpub/pr/include/private/pprmwait.h')
| -rw-r--r-- | nsprpub/pr/include/private/pprmwait.h | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/nsprpub/pr/include/private/pprmwait.h b/nsprpub/pr/include/private/pprmwait.h new file mode 100644 index 0000000000..3e4057c5f4 --- /dev/null +++ b/nsprpub/pr/include/private/pprmwait.h @@ -0,0 +1,103 @@ +/* -*- 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 */ |