IO

To allow flexible IO, the Flesh itself does not provide any output routines, however it provides a mechanism for thorns to register different routines as IO methods (see chapter D8). Application thorns can interact with the different IO methods through the following function calls:

CCTK_OutputGH (const cGH *GH)

This call loops over all registered IO methods, calling the routine that each method has registered for OutputGH. The expected behaviour of any OutputGH routine is to loop over all GH variables outputting them if the IO method contains appropriate routines (that is, not all methods will supply routines to output all different types of variables) and if the method decides it is an appropriate time to output.

CCTK_OutputVar (const cGH *GH, const char *varname)

Output a variable varname looping over all registered IO methods. varname may have an optional I/O options string appended. The output should take place if at all possible. If output goes into a file and the appropriate file exists the data is appended, otherwise a new file is created.

CCTK_OutputVarAs (const cGH *GH, const char *varname, const char *alias)

Output a variable varname looping over all registered IO methods. varname may have an optional I/O options string appended. The output should take place if at all possible. If output goes into a file and the appropriate file exists the data is appended, otherwise a new file is created. Uses alias as the name of the variable for the purpose of constructing a filename.

CCTK_OutputVarByMethod (const cGH *GH, const char *varname, const char *methodname)

Output a variable varname using the IO method methodname if it is registered. varname may have an optional I/O options string appended. The output should take place if at all possible. If output goes into a file and the appropriate file exists the data is appended, otherwise a new file is created.

CCTK_OutputVarAsByMethod (const cGH *GH, const char *varname, const char *methodname,
const char *alias)

Output a variable varname using the IO method methodname if it is registered. varname may have an optional I/O options string appended. The output should take place if at all possible. If output goes into a file and the appropriate file exists the data is appended, otherwise a new file is created. Uses alias as the name of the variable for the purpose of constructing a filename.