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Mutex error check will capture trying to take the lock recursively and other problems that rwlock won't. At the expense of concurrency, adda debug mode that uses a mutex in place of a rwsem. Signed-off-by: Ian Rogers <irogers@google.com> Cc: K Prateek Nayak <kprateek.nayak@amd.com> Cc: Ravi Bangoria <ravi.bangoria@amd.com> Cc: Sandipan Das <sandipan.das@amd.com> Cc: Anshuman Khandual <anshuman.khandual@arm.com> Cc: German Gomez <german.gomez@arm.com> Cc: James Clark <james.clark@arm.com> Cc: Nick Terrell <terrelln@fb.com> Cc: Sean Christopherson <seanjc@google.com> Cc: Changbin Du <changbin.du@huawei.com> Cc: liuwenyu <liuwenyu7@huawei.com> Cc: Yang Jihong <yangjihong1@huawei.com> Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Miguel Ojeda <ojeda@kernel.org> Cc: Song Liu <song@kernel.org> Cc: Leo Yan <leo.yan@linaro.org> Cc: Kajol Jain <kjain@linux.ibm.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Kan Liang <kan.liang@linux.intel.com> Cc: Athira Rajeev <atrajeev@linux.vnet.ibm.com> Cc: Yanteng Si <siyanteng@loongson.cn> Cc: Liam Howlett <liam.howlett@oracle.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Link: https://lore.kernel.org/r/20231024222353.3024098-2-irogers@google.com Signed-off-by: Namhyung Kim <namhyung@kernel.org>
30 lines
600 B
C
30 lines
600 B
C
#ifndef _PERF_RWSEM_H
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#define _PERF_RWSEM_H
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#include <pthread.h>
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#include "mutex.h"
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/*
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* Mutexes have additional error checking. Enable to use a mutex rather than a
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* rwlock for debugging.
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*/
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#define RWS_ERRORCHECK 0
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struct rw_semaphore {
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#if RWS_ERRORCHECK
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struct mutex mtx;
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#else
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pthread_rwlock_t lock;
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#endif
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};
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int init_rwsem(struct rw_semaphore *sem);
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int exit_rwsem(struct rw_semaphore *sem);
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int down_read(struct rw_semaphore *sem);
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int up_read(struct rw_semaphore *sem);
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int down_write(struct rw_semaphore *sem);
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int up_write(struct rw_semaphore *sem);
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#endif /* _PERF_RWSEM_H */
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