fssystem: add unique lock apis

2022-03-28 14:29:22 -07:00
parent 28f11a86fd
commit 2e6223d9d0
2 changed files with 112 additions and 3 deletions
--- a/libraries/libstratosphere/source/fssystem/fssystem_utility.cpp
+++ b/libraries/libstratosphere/source/fssystem/fssystem_utility.cpp
@@ -158,6 +158,18 @@ namespace ams::fssystem {
        R_SUCCEED();
    }

+    Result TryAcquireCountSemaphore(util::unique_lock<SemaphoreAdaptor> *out, SemaphoreAdaptor *adaptor) {
+        /* Create deferred unique lock. */
+        util::unique_lock<SemaphoreAdaptor> lock(*adaptor, std::defer_lock);
+
+        /* Try to lock. */
+        R_UNLESS(lock.try_lock(), fs::ResultOpenCountLimit());
+
+        /* Set the output lock. */
+        *out = std::move(lock);
+        R_SUCCEED();
+    }
+
    void AddCounter(void *_counter, size_t counter_size, u64 value) {
        u8 *counter   = static_cast<u8 *>(_counter);
        u64 remaining = value;