[BUG]: Legacy/per-thread default streams should be singletons

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I confirmed there appear to be no duplicate issues for this bug and that I agree to the Code of Conduct

Type of Bug

Runtime Error

Component

cuda.core

Describe the bug

When #1483 started I missed that we wanted to expose them as singletons:

cuda-python/cuda_core/cuda/core/_stream.pyx

Lines 420 to 422 in 264524b

    
           # standard python objects, public 
        
           LEGACY_DEFAULT_STREAM = C_LEGACY_DEFAULT_STREAM 
        
           PER_THREAD_DEFAULT_STREAM = C_PER_THREAD_DEFAULT_STREAM

whereas the public methods exposed by #1483 would always return new Python instances. We should fix it before v0.6.0 code freeze.

How to Reproduce

n/a

Expected behavior

n/a

Operating System

No response

nvidia-smi output

No response

fix: Make legacy_default() and per_thread_default() return singletons -

@leofang

Hello @leofang, I've fixed this bug. Could you please review PR #1496? Thanks.

Fix/default stream singletons (#1496)

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[BUG]: Legacy/per-thread default streams should be singletons #1494

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	# standard python objects, public
	LEGACY_DEFAULT_STREAM = C_LEGACY_DEFAULT_STREAM
	PER_THREAD_DEFAULT_STREAM = C_PER_THREAD_DEFAULT_STREAM

[BUG]: Legacy/per-thread default streams should be singletons #1494

Description

Is this a duplicate?

Type of Bug

Component

Describe the bug

How to Reproduce

Expected behavior

Operating System

nvidia-smi output

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Monishver11 commented on Jan 15, 2026

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