[coreboot-gerrit] Change in coreboot[master]: lib/thread: Add thread_yield helper method

[Raul Rangel (Code Review)]

Raul Rangel has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/56349 )

Change subject: lib/thread: Add thread_yield helper method
......................................................................

lib/thread: Add thread_yield helper method

This helper method is just a shorthand for
`thread_yield_microseconds(0)`. I think it makes it clear that we want
to yield a thread without delaying.

BUG=b:179699789
TEST=build test

Suggested-by: Julius Werner 
Signed-off-by: Raul E Rangel 
Change-Id: Id8b60c35b183cff6871d7ba70b36eb33b136c735
---
M src/include/thread.h
M src/lib/thread.c
2 files changed, 13 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/49/56349/1

diff --git a/src/include/thread.h b/src/include/thread.h
index da8ed72..6df9d7e 100644
--- a/src/include/thread.h
+++ b/src/include/thread.h
@@ -33,6 +33,10 @@
  * machine. */
 int thread_run_until(void (*func)(void *), void *arg,
    	     boot_state_t state, boot_state_sequence_t seq);
+
+/* Return 0 on successful yield, < 0 when thread did not yield. */
+int thread_yield(void);
+
 /* Return 0 on successful yield for the given amount of time, < 0 when thread
  * did not yield. */
 int thread_yield_microseconds(unsigned int microsecs);
@@ -64,6 +68,10 @@
 {
    return -1;
 }
+static inline int thread_yield(void)
+{
+	return -1;
+}
 static inline int thread_yield_microseconds(unsigned int microsecs)
 {
    return -1;
diff --git a/src/lib/thread.c b/src/lib/thread.c
index 782a63e..a8c0772c 100644
--- a/src/lib/thread.c
+++ b/src/lib/thread.c
@@ -332,6 +332,11 @@
    return 0;
 }

+int thread_yield(void)
+{
+	return thread_yield_microseconds(0);
+}
+
 int thread_yield_microseconds(unsigned int microsecs)
 {
    struct thread *current;