src/comm/Loops.h

   1 /*
   2  * Copyright (C) 1996-2015 The Squid Software Foundation and contributors
   3  *
   4  * Squid software is distributed under GPLv2+ license and includes
   5  * contributions from numerous individuals and organizations.
   6  * Please see the COPYING and CONTRIBUTORS files for details.
   7  */
   8
   9 #ifndef _SQUID_SRC_COMM_LOOPS_H
  10 #define _SQUID_SRC_COMM_LOOPS_H
  11
  12 #include "comm/Flag.h"
  13 #include "comm/forward.h"
  14
  15 /* Comm layer select loops API.
  16  *
  17  * These API functions must be implemented by all FD IO loops used by Squid.
  18  * Defines are provided short-term for legacy code. These will disappear soon.
  19  */
  20
  21 namespace Comm
  22 {
  23
  24 /// Initialize the module on Squid startup
  25 void SelectLoopInit(void);
  26
  27 /// Mark an FD to be watched for its IO status.
  28 void SetSelect(int, unsigned int, PF *, void *, time_t);
  29
  30 /// reset/undo/unregister the watch for an FD which was set by Comm::SetSelect()
  31 void ResetSelect(int);
  32
  33 /** Perform a select() or equivalent call.
  34  * This is used by the main select loop engine to check for FD with IO available.
  35  */
  36 Comm::Flag DoSelect(int);
  37
  38 void QuickPollRequired(void);
  39
  40 /**
  41  * Max number of UDP messages to receive per call to the UDP receive poller.
  42  * This is a per-port limit for ICP/HTCP ports.
  43  * DNS has a separate limit.
  44  */
  45 #if _SQUID_WINDOWS_
  46 #define INCOMING_UDP_MAX 1
  47 #else
  48 #define INCOMING_UDP_MAX 15
  49 #endif
  50
  51 /**
  52  * Max number of DNS messages to receive per call to DNS read handler
  53  */
  54 #if _SQUID_WINDOWS_
  55 #define INCOMING_DNS_MAX 1
  56 #else
  57 #define INCOMING_DNS_MAX 15
  58 #endif
  59
  60 /**
  61  * Max number of new TCP connections to accept per call to the TCP listener poller.
  62  * This is a per-port limit for HTTP/HTTPS ports.
  63  */
  64 #if _SQUID_WINDOWS_
  65 #define INCOMING_TCP_MAX 1
  66 #else
  67 #define INCOMING_TCP_MAX 10
  68 #endif
  69 #define INCOMING_TOTAL_MAX (INCOMING_TCP_MAX+INCOMING_UDP_MAX+INCOMING_DNS_MAX)
  70
  71 } // namespace Comm
  72
  73 #endif /* _SQUID_SRC_COMM_LOOPS_H */
  74