git.m6w6.name Git - m6w6/libmemcached/blob - docs/memcached_auto.pod

   1 =head1 NAME
   2
   3 memcached_increment, memcached_decrement,
   4 memcached_increment_with_initial, memcached_decrement_with_initial - Manipulate
   5 counters
   6
   7 =head1 LIBRARY
   8
   9 C Client Library for memcached (libmemcached, -lmemcached)
  10
  11 =head1 SYNOPSIS
  12
  13   #include <memcached.h>
  14
  15   memcached_return
  16     memcached_increment (memcached_st *ptr,
  17                          const char *key, size_t key_length,
  18                          unsigned int offset,
  19                          uint64_t *value);
  20
  21   memcached_return
  22     memcached_decrement (memcached_st *ptr,
  23                          const char *key, size_t key_length,
  24                          unsigned int offset,
  25                          uint64_t *value);
  26
  27   memcached_return
  28     memcached_increment_with_initial (memcached_st *ptr,
  29                                       const char *key,
  30                                       size_t key_length,
  31                                       uint64_t offset,
  32                                       uint64_t initial,
  33                                       time_t expiration,
  34                                       uint64_t *value);
  35
  36   memcached_return
  37     memcached_decrement_with_initial (memcached_st *ptr,
  38                                       const char *key,
  39                                       size_t key_length,
  40                                       uint64_t offset,
  41                                       uint64_t initial,
  42                                       time_t expiration,
  43                                       uint64_t *value);
  44
  45 =head1 DESCRIPTION
  46
  47 memcached(1) servers have the ability to increment and decrement keys
  48 (overflow and underflow are not detected). This gives you the ability to use
  49 memcached to generate shared sequences of values.
  50
  51 memcached_increment() takes a key and keylength and increments the value by
  52 the offset passed to it. The value is then returned via the unsigned int
  53 value pointer you pass to it.
  54
  55 memcached_decrement() takes a key and keylength and decrements the value by
  56 the offset passed to it. The value is then returned via the unsigned int
  57 value pointer you pass to it.
  58
  59 memcached_increment_with_initial() takes a key and keylength and increments
  60 the value by the offset passed to it. If the object specified by key does
  61 not exist, one of two things may happen: If the expiration value is
  62 MEMCACHED_EXPIRATION_NOT_ADD, the operation will fail. For all other
  63 expiration values, the operation will succeed by seeding the value for that
  64 key with a initial value to expire with the provided expiration time. The
  65 flags will be set to zero.The value is then returned via the unsigned int
  66 value pointer you pass to it.
  67
  68 memcached_decrement_with_initial() takes a key and keylength and decrements
  69 the value by the offset passed to it. If the object specified by key does
  70 not exist, one of two things may happen: If the expiration value is
  71 MEMCACHED_EXPIRATION_NOT_ADD, the operation will fail. For all other
  72 expiration values, the operation will succeed by seeding the value for that
  73 key with a initial value to expire with the provided expiration time. The
  74 flags will be set to zero.The value is then returned via the unsigned int
  75 value pointer you pass to it.
  76
  77 =head1 RETURN
  78
  79 A value of type C<memcached_return> is returned.
  80 On success that value will be C<MEMCACHED_SUCCESS>.
  81 Use memcached_strerror() to translate this value to a printable string.
  82
  83 =head1 HOME
  84
  85 To find out more information please check:
  86 L<http://tangent.org/552/libmemcached.html>
  87
  88 =head1 AUTHOR
  89
  90 Brian Aker, E<lt>brian@tangent.orgE<gt>
  91
  92 =head1 SEE ALSO
  93
  94 memcached(1) libmemcached(3) memcached_strerror(3)
  95
  96 =cut
  97