mirror of
https://github.com/RetroPortingToolKit/psxrecomp
synced 2026-10-28 10:59:16 -04:00
Alex Vanderveen
44 lines
1.6 KiB
C
44 lines
1.6 KiB
C
/*
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* psx_cpu_pin.h -- PSX-Link pair CPU placement.
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*
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* A link-lobby machine runs TWO full console simulations: the netplay client
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* (driver) and the spawned headless follower. Both carry an emulation thread
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* that needs most of a core to hold the 20 ms PAL tick budget; when the
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* kernel lands them on SMT siblings of the same physical core they gate each
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* other and the whole 4-seat session drops below 50 fps (lockstep couples
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* every machine to the slowest one).
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*
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* psx_cpu_pin_link_role() pins the CALLING thread (the emulation thread) to
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* a dedicated physical core: role 0 (driver) takes the fastest eligible
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* core, role 1 (follower) the second-fastest. Both processes enumerate the
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* same topology, so the picks never collide. Threads created AFTER a pin
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* inherit it -- helper threads that must float (present thread) call
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* psx_cpu_pin_unpin_self() to restore the pre-pin process mask.
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*
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* PSX_LINK_PIN=0 disable
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* PSX_LINK_PIN=<a>,<b> explicit logical CPU ids (driver=a, follower=b)
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*
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* Linux only; a no-op elsewhere.
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*/
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#ifndef PSX_CPU_PIN_H
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#define PSX_CPU_PIN_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* role: 0 = link driver (netplay client), 1 = link follower. Call from the
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* emulation thread once all session service threads exist (they must not
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* inherit the pin). Logs the placement (or why it declined). */
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void psx_cpu_pin_link_role(int role);
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/* Restore the calling thread to the process's pre-pin affinity mask. For
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* threads spawned from a pinned emulation thread that should float. Safe to
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* call when no pin ever happened. */
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void psx_cpu_pin_unpin_self(void);
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#ifdef __cplusplus
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}
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#endif
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#endif /* PSX_CPU_PIN_H */
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