.. c:macro:: XBT_LOG_EXTERNAL_CATEGORY(category)
- Make an external category (i.e., a category declared in another source file) visible from this source file.
+ Make an external category (i.e., a category declared in another source file) visible from this source file.
In each source file, at most one one category can be the default one.
.. c:macro:: XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(category)
#include "xbt/log.h"
- / * create a category and a default subcategory * /
+ /* create a category and a default subcategory */
XBT_LOG_NEW_CATEGORY(VSS);
XBT_LOG_NEW_DEFAULT_SUBCATEGORY(SA, VSS);
int main() {
- / * Now set the parent's priority. (the string would typically be a runtime option) * /
+ /* Now set the parent's priority. (the string would typically be a runtime option) */
xbt_log_control_set("SA.thresh:info");
- / * This request is enabled, because WARNING >= INFO. * /
+ /* This request is enabled, because WARNING >= INFO. */
XBT_CWARN(VSS, "Low fuel level.");
- / * This request is disabled, because DEBUG < INFO. * /
+ /* This request is disabled, because DEBUG < INFO. */
XBT_CDEBUG(VSS, "Starting search for nearest gas station.");
- / * The default category SA inherits its priority from VSS. Thus,
- the following request is enabled because INFO >= INFO. * /
+ /* The default category SA inherits its priority from VSS. Thus,
+ the following request is enabled because INFO >= INFO. */
XBT_INFO("Located nearest gas station.");
- / * This request is disabled, because DEBUG < INFO. * /
+ /* This request is disabled, because DEBUG < INFO. */
XBT_DEBUG("Exiting gas station search");
}
You can even specify a compile-time threshold that will completely remove every logging below the specified priority. Passing ``-DNDEBUG`` to cmake disables every logging of
priority below INFO while ``-DNLOG`` removes any logging at compile time. Note that using this feature may hinder the stability of SimGrid, as we consider the logs to be fast
enough to not thoughtfully test the case where they are removed at compile time.
+
+Dynamic arrays
+**************
+
+As SimGrid used to be written in pure C, it used to rely on custom data containers such as dynamic arrays and dictionnaries. Nowadays, the standard library of
+C++ is used internally, but some part of the interface still rely on the old containers, that are thus still available.
+
+.. warning::
+
+ You should probably not start a new project using these data structures, as we will :ref:`deprecate them from SimGrid <deprecation_policy>`
+ as soon as possible. Better implementations exist out there anyway, in particular if you're not writting pure C code.
+
+.. doxygentypedef:: xbt_dynar_t
+.. doxygentypedef:: const_xbt_dynar_t
+
+Creation and destruction
+========================
+
+.. doxygenfunction:: xbt_dynar_new
+.. doxygenfunction:: xbt_dynar_free
+.. doxygenfunction:: xbt_dynar_free_container
+
+Dynars as regular arrays
+========================
+
+.. doxygenfunction:: xbt_dynar_get_cpy
+.. doxygenfunction:: xbt_dynar_insert_at
+.. doxygenfunction:: xbt_dynar_remove_at
+.. doxygenfunction:: xbt_dynar_member
+.. doxygenfunction:: xbt_dynar_sort
+
+Dynar size
+==========
+
+.. doxygenfunction:: xbt_dynar_is_empty
+.. doxygenfunction:: xbt_dynar_length
+.. doxygenfunction:: xbt_dynar_reset
+
+Perl-like interface
+===================
+
+.. doxygenfunction:: xbt_dynar_push
+.. doxygenfunction:: xbt_dynar_pop
+.. doxygenfunction:: xbt_dynar_unshift
+.. doxygenfunction:: xbt_dynar_shift
+.. doxygenfunction:: xbt_dynar_map
+
+Direct content manipulation
+===========================
+
+Those functions do not retrieve the content, but only their address.
+
+.. doxygenfunction:: xbt_dynar_set_at_ptr
+.. doxygenfunction:: xbt_dynar_get_ptr
+.. doxygenfunction:: xbt_dynar_insert_at_ptr
+.. doxygenfunction:: xbt_dynar_push_ptr
+.. doxygenfunction:: xbt_dynar_pop_ptr
+
+Dynars of scalars
+=================
+
+While the other functions use a memcpy to retrieve the content into the user provided area, those ones use a
+regular affectation. It only works for scalar values, but should be a little faster.
+
+.. doxygendefine:: xbt_dynar_get_as
+.. doxygendefine:: xbt_dynar_set_as
+
+.. doxygendefine:: xbt_dynar_getlast_as
+.. doxygendefine:: xbt_dynar_getfirst_as
+.. doxygendefine:: xbt_dynar_push_as
+.. doxygendefine:: xbt_dynar_pop_as
+
+Iterating over Dynars
+=====================
+
+.. doxygendefine:: xbt_dynar_foreach
+
+Example with scalar values
+==========================
+
+.. code-block:: c
+
+ xbt_dynar_t d = xbt_dynar_new(sizeof(int), nullptr);
+
+ /* 1. Populate the dynar */
+ xbt_dynar_t d = xbt_dynar_new(sizeof(int), nullptr);
+ for (int cpt = 0; cpt < NB_ELEM; cpt++) {
+ xbt_dynar_push_as(d, int, cpt); /* This is faster (and possible only with scalars) */
+ /* xbt_dynar_push(d,&cpt); This would also work */
+ xbt_test_log("Push %d, length=%lu", cpt, xbt_dynar_length(d));
+ }
+
+ /* 2. Traverse manually the dynar */
+ for (cursor = 0; cursor < NB_ELEM; cursor++) {
+ int* iptr = (int*)xbt_dynar_get_ptr(d, cursor);
+ /* 1. Populate further the dynar */
+ for (int cpt = 0; cpt < NB_ELEM; cpt++) {
+ xbt_dynar_insert_at(d, cpt, &cpt);
+ xbt_test_log("Push %d, length=%lu", cpt, xbt_dynar_length(d));
+ }
+
+ /* 3. Traverse the dynar */
+ int cpt;
+ xbt_dynar_foreach(d, cursor, cpt) {
+ xbt_test_assert(cursor == (unsigned int) cpt, "The retrieved value is not the same than the injected one (%u!=%d)", cursor, cpt);
+ }
+
+ /* 4. Reset the values */
+ for (int i = 0; i < NB_ELEM; i++)
+ *(int*)xbt_dynar_get_ptr(d, i) = i;
+
+ /* 5. Shift all the values */
+ for (int i = 0; i < NB_ELEM; i++) {
+ int val;
+ xbt_dynar_shift(d, &val);
+ }
+ // the dynar is empty after shifting all values
+
+ /* 5. Free the resources */
+ xbt_dynar_free(&d);
+
+Example with pointed values
+===========================
+
+.. code-block:: c
+
+ xbt_dynar_t d = xbt_dynar_new(sizeof(char*), &xbt_free_ref);
+
+ /// Push/shift example
+ for (int i = 0; i < NB_ELEM; i++) {
+ char * val = xbt_strdup("hello");
+ xbt_dynar_push(d, &val);
+ }
+ for (int i = 0; i < NB_ELEM; i++) {
+ char *val;
+ xbt_dynar_shift(d, &val);
+ REQUIRE("hello" == val);
+ xbt_free(val);
+ }
+ xbt_dynar_free(&d);
+
+ /// Unshift, traverse and pop example
+ d = xbt_dynar_new(sizeof(char**), &xbt_free_ref);
+ for (int i = 0; i < NB_ELEM; i++) {
+ std::string val = std::to_string(i);
+ s1 = xbt_strdup(val.c_str());
+ xbt_dynar_unshift(d, &s1);
+ }
+ /* 2. Traverse the dynar with the macro */
+ xbt_dynar_foreach (d, iter, s1) {
+ std::string val = std::to_string(NB_ELEM - iter - 1);
+ REQUIRE(s1 == val); // The retrieved value is not the same than the injected one
+ }
+ /* 3. Traverse the dynar with the macro */
+ for (int i = 0; i < NB_ELEM; i++) {
+ std::string val = std::to_string(i);
+ xbt_dynar_pop(d, &s2);
+ REQUIRE(s2 == val); // The retrieved value is not the same than the injected one
+ xbt_free(s2);
+ }
+ /* 4. Free the resources */
+ xbt_dynar_free(&d);
