Sojus07/hackrf
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Add comment about constraints on locking primitives.

Browse Source
This commit is contained in:
Martin Ling
2024-12-16 21:19:12 +00:00
parent a272e97fda
commit f3e7d10d07
1 changed files with 6 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
firmware/common/locking.h
View File

@ -26,6 +26,12 @@
#include <libopencm3/cm3/sync.h> #include <libopencm3/cm3/sync.h>
/* Primitives for implementing locking.
*
* Must always be used in a pair, with a call to load_exclusive being
* followed immediately or near-immediately by a call to store_exclusive().
* Failure to observe this rule may lead to undefined results. */
// Use ldrex and strex directly if available. // Use ldrex and strex directly if available.
// Otherwise, disable interrupts to ensure exclusivity. // Otherwise, disable interrupts to ensure exclusivity.
#if defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7EM__) #if defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7EM__)