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authorDave Barach <dave@barachs.net>2019-05-14 18:01:44 -0400
committerFlorin Coras <florin.coras@gmail.com>2019-05-16 16:11:23 +0000
commitf8d50682cd1245f6f5ce4c846ca6f1bdc11255a6 (patch)
tree8ecc60e4715db88bdbc8ea6bd0170fbae6f645eb /src/examples/vlib
parentc1f93067ed4b9954bbba82e2c9c104b22e2f7f33 (diff)
init / exit function ordering
The vlib init function subsystem now supports a mix of procedural and formally-specified ordering constraints. We should eliminate procedural knowledge wherever possible. The following schemes are *roughly* equivalent: static clib_error_t *init_runs_first (vlib_main_t *vm) { clib_error_t *error; ... do some stuff... if ((error = vlib_call_init_function (init_runs_next))) return error; ... } VLIB_INIT_FUNCTION (init_runs_first); and static clib_error_t *init_runs_first (vlib_main_t *vm) { ... do some stuff... } VLIB_INIT_FUNCTION (init_runs_first) = { .runs_before = VLIB_INITS("init_runs_next"), }; The first form will [most likely] call "init_runs_next" on the spot. The second form means that "init_runs_first" runs before "init_runs_next," possibly much earlier in the sequence. Please DO NOT construct sets of init functions where A before B actually means A *right before* B. It's not necessary - simply combine A and B - and it leads to hugely annoying debugging exercises when trying to switch from ad-hoc procedural ordering constraints to formal ordering constraints. Change-Id: I5e4353503bf43b4acb11a45fb33c79a5ade8426c Signed-off-by: Dave Barach <dave@barachs.net>
Diffstat (limited to 'src/examples/vlib')
-rw-r--r--src/examples/vlib/main_stub.c15
1 files changed, 7 insertions, 8 deletions
diff --git a/src/examples/vlib/main_stub.c b/src/examples/vlib/main_stub.c
index c5c19aaa01a..3735055d789 100644
--- a/src/examples/vlib/main_stub.c
+++ b/src/examples/vlib/main_stub.c
@@ -25,18 +25,17 @@ main (int argc, char *argv[])
static clib_error_t *
main_stub_init (vlib_main_t * vm)
{
- clib_error_t *error;
-
- if ((error = unix_physmem_init (vm)))
- return error;
-
- if ((error = vlib_call_init_function (vm, unix_cli_init)))
- return error;
+ clib_error_t *error = 0;
return error;
}
-VLIB_INIT_FUNCTION (main_stub_init);
+/* *INDENT-OFF* */
+VLIB_INIT_FUNCTION (main_stub_init) =
+{
+ .runs_after = VLIB_INITS("unix_physmem_init", "unix_cli_init"),
+};
+/* *INDENT-ON* */
#if 0
/* Node test code. */