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[list] Add list_first_entry()

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There are several points in the iPXE codebase where
list_for_each_entry() is (ab)used to extract only the first entry from
a list.  Add a macro list_first_entry() to make this code easier to
read.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2010-11-08 02:51:18 +00:00
parent 295ba15bd6
commit ea631f6fb8
7 changed files with 41 additions and 28 deletions
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4
src/core/process.c
View File

@@ -83,7 +83,8 @@ void process_del ( struct process *process ) {
void step ( void ) {
struct process *process;
list_for_each_entry ( process, &run_queue, list ) {
if ( ( process = list_first_entry ( &run_queue, struct process,
list ) ) ) {
list_del ( &process->list );
list_add_tail ( &process->list, &run_queue );
ref_get ( process->refcnt ); /* Inhibit destruction mid-step */
@@ -93,7 +94,6 @@ void step ( void ) {
DBGC2 ( process, "PROCESS %p (%p) finished executing\n",
process, process->step );
ref_put ( process->refcnt ); /* Allow destruction */
break;
}
}