| 
                    unsigned int
                    
                        atomic_dec
                    
                ( | volatile __global
                    unsigned int *p ) | 
| 
                    unsigned int
                    
                        atomic_dec
                    
                ( | volatile __local
                    unsigned int *p ) | 
          Read the 32-bit value (referred to as old) stored at location
          pointed by p. Compute (old - 1) and store result
          at location pointed by p. The function returns old.
        
A 64-bit version of this function, atom_dec, is enabled by cl_khr_int64_base_atomics.
 Copyright © 2007-2013 The Khronos Group Inc. 
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and/or associated documentation files (the
"Materials"), to deal in the Materials without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Materials, and to
permit persons to whom the Materials are furnished to do so, subject to
the condition that this copyright notice and permission notice shall be included
in all copies or substantial portions of the Materials.
Copyright © 2007-2013 The Khronos Group Inc. 
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and/or associated documentation files (the
"Materials"), to deal in the Materials without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Materials, and to
permit persons to whom the Materials are furnished to do so, subject to
the condition that this copyright notice and permission notice shall be included
in all copies or substantial portions of the Materials.