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-rw-r--r--nsprpub/pr/include/private/pprmwait.h103
1 files changed, 103 insertions, 0 deletions
diff --git a/nsprpub/pr/include/private/pprmwait.h b/nsprpub/pr/include/private/pprmwait.h
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+/* -*- 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 */