Function lock_device_creation 

pub fn lock_device_creation() -> ReentrantMutexGuard<'static, ()>

Available on crate feature wgpu only.

Acquire the process-global wgpu device-creation lock. Hold the returned guard across the whole Instance::new → request_adapter → request_device sequence (and drop it once the device exists). Reentrant on the holding thread, so a library call made inside the sequence that takes the lock itself proceeds instead of deadlocking.

Prefer with_device_creation_lock for the common closure shape; this guard form exists for call sites that interleave fallible ? steps and cannot wrap the whole sequence in one closure.

Never hold the guard across an .await: it is !Send, and on a single-threaded executor a second task taking the lock would block the thread. wgpu’s native backend does its creation work when request_adapter / request_device are called and returns an already-resolved future, so locking the call alone is sufficient.