git.m6w6.name Git - awesomized/libmemcached/blob - docs/man/memcached_result_cas.3

   1 .TH "MEMCACHED_RESULT_CAS" "3" "September 18, 2011" "0.52" "libmemcached"
   2 .SH NAME
   3 memcached_result_cas \- Working with result sets
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  32 .
  33 .SH SYNOPSIS
  34 .sp
  35 #include <libmemcached/memcached_pool.h>
  36 .INDENT 0.0
  37 .TP
  38 .B memcached_result_st
  39 .UNINDENT
  40 .INDENT 0.0
  41 .TP
  42 .B memcached_result_st * memcached_result_create (memcached_st *ptr, memcached_result_st *result);
  43 .UNINDENT
  44 .INDENT 0.0
  45 .TP
  46 .B void memcached_result_free (memcached_result_st *result);
  47 .UNINDENT
  48 .INDENT 0.0
  49 .TP
  50 .B const char * memcached_result_key_value (memcached_result_st *result);
  51 .UNINDENT
  52 .INDENT 0.0
  53 .TP
  54 .B size_t memcached_result_key_length (const memcached_result_st *result);
  55 .UNINDENT
  56 .INDENT 0.0
  57 .TP
  58 .B const char *memcached_result_value (memcached_result_st *ptr);
  59 .UNINDENT
  60 .INDENT 0.0
  61 .TP
  62 .B size_t memcached_result_length (const memcached_result_st *ptr);
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  65 .TP
  66 .B uint32_t memcached_result_flags(const \fI\%memcached_result_st\fP\fI\ *result\fP)
  67 .UNINDENT
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  69 .TP
  70 .B uint64_t memcached_result_cas (const memcached_result_st *result);
  71 .UNINDENT
  72 .INDENT 0.0
  73 .TP
  74 .B memcached_return_t memcached_result_set_value(\fI\%memcached_result_st\fP\fI\ *ptr\fP, const char\fI\ *value\fP, size_t\fI\ length\fP)
  75 .UNINDENT
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  77 .TP
  78 .B void memcached_result_set_flags(\fI\%memcached_result_st\fP\fI\ *ptr\fP, uint32_t\fI\ flags\fP)
  79 .UNINDENT
  80 .INDENT 0.0
  81 .TP
  82 .B void memcached_result_set_expiration(\fI\%memcached_result_st\fP\fI\ *ptr\fP, time_t)
  83 .UNINDENT
  84 .sp
  85 Compile and link with \-lmemcachedutil \-lmemcached
  86 .SH DESCRIPTION
  87 .sp
  88 libmemcached(3) can optionally return a \fI\%memcached_result_st\fP which
  89 acts as a result object. The result objects have added benefits over the
  90 character pointer returns, in that they are forward compatible with new
  91 return items that future memcached servers may implement (the best current
  92 example of this is the CAS return item). The structures can also be reused,
  93 which will save on calls to malloc(3). It is suggested that you use result
  94 objects over char * return functions.
  95 .sp
  96 The structure of \fI\%memcached_result_st\fP has been encapsulated, you should
  97 not write code to directly access members of the structure.
  98 .sp
  99 \fBmemcached_result_create()\fP will either allocate memory for a
 100 \fI\%memcached_result_st\fP or will initialize a structure passed to it.
 101 .sp
 102 \fBmemcached_result_free()\fP will deallocate any memory attached to the
 103 structure. If the structure was also allocated, it will deallocate it.
 104 .sp
 105 \fBmemcached_result_key_value()\fP returns the key value associated with the
 106 current result object.
 107 .sp
 108 \fBmemcached_result_key_length()\fP returns the key length associated with
 109 the current result object.
 110 .sp
 111 \fBmemcached_result_value()\fP returns the result value associated with the
 112 current result object.
 113 .sp
 114 \fBmemcached_result_length()\fP returns the result length associated with
 115 the current result object.
 116 .sp
 117 \fI\%memcached_result_flags()\fP returns the flags associated with the
 118 current result object.
 119 .sp
 120 \fBmemcached_result_cas()\fP returns the cas associated with the
 121 current result object. This value will only be available if the server
 122 tests it.
 123 .sp
 124 \fI\%memcached_result_set_value()\fP takes a byte array and a size and sets
 125 the result to this value. This function is used for trigger responses.
 126 .sp
 127 \fBvoid memcached_result_set_flags()\fP takes a result structure and stores
 128 a new value for the flags field.
 129 .sp
 130 \fBvoid memcached_result_set_expiration(A)()\fP takes a result structure and stores a new value for the expiration field (this is only used by read
 131 through triggers).
 132 .sp
 133 You may wish to avoid using memcached_result_create(3) with a
 134 stack based allocation. The most common issues related to ABI safety involve
 135 heap allocated structures.
 136 .SH RETURN
 137 .sp
 138 Varies, see particular functions. All structures must have
 139 \fBmemcached_result_free()\fP called on them for cleanup purposes. Failure
 140 to do this will result in leaked memory.
 141 .SH HOME
 142 .sp
 143 To find out more information please check:
 144 \fI\%http://libmemcached.org/\fP
 145 .SH SEE ALSO
 146 .sp
 147 \fImemcached(1)\fP \fIlibmemcached(3)\fP \fImemcached_strerror(3)\fP
 148 .SH AUTHOR
 149 Brian Aker
 150 .SH COPYRIGHT
 151 2011, Brian Aker DataDifferential, http://datadifferential.com/
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