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// Copyright (c) 2014, Glenn Elliott
// All rights reserved.
#pragma once
#define PGM_CONFIG
/*
Select the primative to use for synchronization.
- For pthread sleeping-mutex + condition variables = 0
- For PGM spinlock + PGM condition variables = 1
*/
#ifndef _USE_LITMUS
#define PGM_SYNC_METHOD 0
/* You must define PGM_ALLOW_P_SPIN if
preemptions remain enabled.
*/
/* #define PGM_SYNC_METHOD 1 */
#else
/* Default to PGM spinlocks under Litmus */
#define PGM_SYNC_METHOD 1
#endif
/*
Select the spinlock type. ticketlock_t is simple,
but queuelock_t is more cache efficient on systems
with large distributed caches (less bouncing of
cache lines).
- ticketlock_t = 0
- queuelock_t = 1
*/
#if (PGM_SYNC_METHOD == 1)
#define PGM_SPINLOCK_TYPE 0
#endif
/*
Select the method tasks use for becoming non-preemptive
while holding spinlocks.
- To allow preemption = 0
- Via disabling interrupts = 1
- Via Litmus's non-preemtion sections = 2
Notes:
1) Options 1 and 2 require tasks to run as root.
2) Disabling interrupts may be unsafe for IPCs
that may block on write. (PGM uses non-blocking
writes whenever possible.)
*/
#ifndef _USE_LITMUS
#define PGM_NP_METHOD 0
/* Uncomment to allow preemptive spinning sync */
/* #define PGM_ALLOW_P_SPIN */
#else
/* Default to Litmus NP sections. */
#define PGM_NP_METHOD 2
#endif
/*
Select support for synchronization between processes.
- Private synchronization = 0
- Shared synchronization = 1
Private syncrhonization is faster, but graphs may
not span multiple processes.
*/
#define PGM_SYNC_SCOPE 0
/*** VALIDATE CONFGURATION ***/
#if (PGM_SYNC_METHOD == 0) && (PGM_NP_METHOD != 0)
#error "Cannot disable interrupts using pthread synchronization."
#endif
#if (PGM_SYNC_METHOD == 1) && (PGM_NP_METHOD == 0) && !defined(PGM_ALLOW_P_SPIN)
#error "Spinlocks are unsafe without non-preemption."
#endif
/*** SET UP CONDITIONAL COMPILATION ***/
#if (PGM_SYNC_METHOD == 0)
#define PGM_USE_PTHREAD_SYNC
#elif (PGM_SYNC_METHOD == 1)
#define PGM_USE_PGM_SYNC
#else
#error "Unknown synchronization method selected."
#endif
#if (PGM_NP_METHOD == 0)
#define PGM_PREEMPTIVE
#elif (PGM_NP_METHOD == 1)
#define PGM_NP_INTERRUPTS
#elif (PGM_NP_METHOD == 2)
#define PGM_NP_LITMUS
#else
#error "Unknown non-preemption method."
#endif
#if (PGM_SYNC_SCOPE == 0)
#define PGM_PRIVATE
#elif (PGM_SYNC_SCOPE == 1)
#define PGM_SHARED
#else
#error "Unknown synchronization scope."
#endif
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