1 /* config - Dictionary where the type of each cell is provided. */
3 /* This is useful to build named structs, like option or property sets. */
5 /* Copyright (c) 2004-2007, 2009-2014. The SimGrid Team.
6 * All rights reserved. */
8 /* This program is free software; you can redistribute it and/or modify it
9 * under the terms of the license (GNU LGPL) which comes with this package. */
11 #ifndef _XBT_CONFIG_H_
12 #define _XBT_CONFIG_H_
14 #include "xbt/dynar.h"
19 /** @addtogroup XBT_config
20 * @brief Changing the configuration of SimGrid components (grounding feature)
22 * All modules of the SimGrid toolkit can be configured with this API.
23 * User modules and libraries can also use these facilities to handle their own configuration.
25 * A configuration set contain several \e variables which have a unique name in the set and can take a given type of
26 * value. For example, it may contain a \a size variable, accepting \e int values.
28 * It is impossible to set a value to a variable which has not been registered before.
29 * Usually, the module registers all the options it accepts in the configuration set, during its initialization and
30 * user code then set and unset values.
32 * The easiest way to register a variable is to use the xbt_str_register_str function, which accepts a string
33 * representation of the config element descriptor. The syntax is the following:
34 * \verbatim <name>:<min nb>_to_<max nb>_<type>\endverbatim
36 * For example, <tt>size:1_to_1_int</tt> describes a variable called \e size which must take exactly one value, and
37 * the value being an integer. Set the maximum to 0 to disable the upper bound on data count.
39 * Another example could be <tt>outputfiles:0_to_10_string</tt> which describes a variable called \e outputfiles and
40 * which can take between 0 and 10 strings as value.
42 * To some extend, configuration sets can be seen as typed hash structures.
44 * \section XBT_cfg_ex Example of use
46 * \dontinclude config.c
48 * First, let's create a configuration set with some registered variables.
49 * This must be done by the configurable library before the user interactions.
52 * \until end_of_make_set
54 * Now, set and get a single value
55 * \skip get_single_value
59 * And now, set and get a multiple value
60 * \skip get_multiple_value
64 * All those functions throws mismatch_error if asked to deal with an unregistered variable.
68 /** @defgroup XBT_cfg_use User interface: changing values
71 * This is the only interface you should use unless you want to let your own code become configurable with this.
73 * If the variable accept at most one value, those functions replace the current value with the provided one. If max>1,
74 * the provided value is appended to the list.
76 * string values are strdup'ed before use, so you can (and should) free your copy
80 /** @brief Configuration set's data type is opaque. */
87 typedef simgrid::config::Config* xbt_cfg_t;
89 typedef void* xbt_cfg_t;
92 XBT_PUBLIC(void) xbt_cfg_set_parse(const char *options);
94 /* Set the value of the cell \a name in \a cfg with the provided value.*/
95 XBT_PUBLIC(void) xbt_cfg_set_int (const char *name, int val);
96 XBT_PUBLIC(void) xbt_cfg_set_double (const char *name, double val);
97 XBT_PUBLIC(void) xbt_cfg_set_string (const char *name, const char *val);
98 XBT_PUBLIC(void) xbt_cfg_set_boolean (const char *name, const char *val);
99 XBT_PUBLIC(void) xbt_cfg_set_as_string(const char *name, const char *val);
102 Set the default value of the cell \a name in \a cfg with the provided value.
103 If it was already set to something (possibly from the command line), do nothing.
105 XBT_PUBLIC(void) xbt_cfg_setdefault_int (const char *name, int val);
106 XBT_PUBLIC(void) xbt_cfg_setdefault_double (const char *name, double val);
107 XBT_PUBLIC(void) xbt_cfg_setdefault_string (const char *name, const char *val);
108 XBT_PUBLIC(void) xbt_cfg_setdefault_boolean(const char *name, const char *val);
110 /** @brief Return if configuration is set by default*/
111 XBT_PUBLIC(int) xbt_cfg_is_default_value(const char *name);
115 /** @defgroup XBT_cfg_decl Configuration type declaration and memory management
116 * @ingroup XBT_config
121 /** \brief Callback types. They get the name of the modified entry, and the position of the changed value */
122 typedef void (*xbt_cfg_cb_t) (const char * name);
124 XBT_PUBLIC(xbt_cfg_t) xbt_cfg_new(void);
125 XBT_PUBLIC(void) xbt_cfg_free(xbt_cfg_t * cfg);
126 XBT_PUBLIC(void) xbt_cfg_dump(const char *name, const char *indent, xbt_cfg_t cfg);
130 /** @defgroup XBT_cfg_register Registering stuff
131 * @ingroup XBT_config
133 * This how to add new variables to an existing configuration set. Use it to make your code configurable.
137 XBT_PUBLIC(void) xbt_cfg_register_double (const char *name, double default_val, xbt_cfg_cb_t cb_set, const char *desc);
138 XBT_PUBLIC(void) xbt_cfg_register_int (const char *name, int default_val, xbt_cfg_cb_t cb_set, const char *desc);
139 XBT_PUBLIC(void) xbt_cfg_register_string (const char *name, const char*default_val,xbt_cfg_cb_t cb_set, const char *desc);
140 XBT_PUBLIC(void) xbt_cfg_register_boolean(const char *name, const char*default_val,xbt_cfg_cb_t cb_set, const char *desc);
141 XBT_PUBLIC(void) xbt_cfg_register_alias(const char *newname, const char *oldname);
143 XBT_PUBLIC(void) xbt_cfg_aliases(void);
144 XBT_PUBLIC(void) xbt_cfg_help(void);
147 /** @defgroup XBT_cfg_get Getting the stored values
148 * @ingroup XBT_config
150 * This is how to retrieve the values stored in the configuration set. This is only intended to configurable code,
153 * Note that those function return a pointer to the values actually stored in the set. Do not modify them unless you
154 * really know what you're doing. Likewise, do not free the strings after use, they are not copy of the data, but the
160 XBT_PUBLIC(int) xbt_cfg_get_int(const char *name);
161 XBT_PUBLIC(double) xbt_cfg_get_double(const char *name);
162 XBT_PUBLIC(char *) xbt_cfg_get_string(const char *name);
163 XBT_PUBLIC(int) xbt_cfg_get_boolean(const char *name);
168 #endif /* _XBT_CONFIG_H_ */