git.m6w6.name Git - m6w6/libmemcached/blob - libmemcached/memcached_purge.c

   1 #include "common.h"
   2 #include "memcached_io.h"
   3 #include "memcached_constants.h"
   4
   5 memcached_return memcached_purge(memcached_server_st *ptr)
   6 {
   7   uint32_t x;
   8   memcached_return ret= MEMCACHED_SUCCESS;
   9
  10   if (ptr->root->purging || /* already purging */
  11       (memcached_server_response_count(ptr) < ptr->root->io_msg_watermark &&
  12       ptr->io_bytes_sent < ptr->root->io_bytes_watermark) ||
  13       (ptr->io_bytes_sent >= ptr->root->io_bytes_watermark &&
  14       memcached_server_response_count(ptr) < 2))
  15   {
  16     return MEMCACHED_SUCCESS;
  17   }
  18
  19   /* memcached_io_write and memcached_response may call memcached_purge
  20      so we need to be able stop any recursion.. */
  21   ptr->root->purging= 1;
  22
  23   WATCHPOINT_ASSERT(ptr->fd != -1);
  24   /* Force a flush of the buffer to ensure that we don't have the n-1 pending
  25      requests buffered up.. */
  26   if (memcached_io_write(ptr, NULL, 0, 1) == -1)
  27   {
  28     ptr->root->purging= 0;
  29     return MEMCACHED_WRITE_FAILURE;
  30   }
  31   WATCHPOINT_ASSERT(ptr->fd != -1);
  32
  33   uint32_t no_msg= memcached_server_response_count(ptr) - 1;
  34   if (no_msg > 0)
  35   {
  36     memcached_result_st result;
  37     memcached_result_st *result_ptr;
  38     char buffer[SMALL_STRING_LEN];
  39
  40     /*
  41      * We need to increase the timeout, because we might be waiting for
  42      * data to be sent from the server (the commands was in the output buffer
  43      * and just flushed
  44      */
  45     int32_t timeo= ptr->root->poll_timeout;
  46     ptr->root->poll_timeout= 2000;
  47
  48     result_ptr= memcached_result_create(ptr->root, &result);
  49     WATCHPOINT_ASSERT(result_ptr);
  50
  51     for (x= 0; x < no_msg; x++)
  52     {
  53       memcached_result_reset(result_ptr);
  54       memcached_return rc= memcached_read_one_response(ptr, buffer,
  55                                                        sizeof (buffer),
  56                                                        result_ptr);
  57       /*
  58        * Purge doesn't care for what kind of command results that is received.
  59        * The only kind of errors I care about if is I'm out of sync with the
  60        * protocol or have problems reading data from the network..
  61        */
  62       if (rc== MEMCACHED_PROTOCOL_ERROR || rc == MEMCACHED_UNKNOWN_READ_FAILURE)
  63       {
  64         WATCHPOINT_ERROR(rc);
  65         ret = rc;
  66         memcached_io_reset(ptr);
  67       }
  68     }
  69
  70     memcached_result_free(result_ptr);
  71     ptr->root->poll_timeout= timeo;
  72   }
  73   ptr->root->purging= 0;
  74
  75   return ret;
  76 }