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musl/include/sys/membarrier.h

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add membarrier syscall wrapper, refactor dynamic tls install to use it the motivation for this change is twofold. first, it gets the fallback logic out of the dynamic linker, improving code readability and organization. second, it provides application code that wants to use the membarrier syscall, which depends on preregistration of intent before the process becomes multithreaded unless unbounded latency is acceptable, with a symbol that, when linked, ensures that this registration happens.
2019-02-22 07:56:10 +00:00
#ifndef _SYS_MEMBARRIER_H
#define _SYS_MEMBARRIER_H
#define MEMBARRIER_CMD_QUERY 0
#define MEMBARRIER_CMD_GLOBAL 1
#define MEMBARRIER_CMD_GLOBAL_EXPEDITED 2
#define MEMBARRIER_CMD_REGISTER_GLOBAL_EXPEDITED 4
#define MEMBARRIER_CMD_PRIVATE_EXPEDITED 8
#define MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED 16
#define MEMBARRIER_CMD_PRIVATE_EXPEDITED_SYNC_CORE 32
#define MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED_SYNC_CORE 64
sys/membarrier.h: add new constants from linux v5.10 can cause rseq restart on another cpu to synchronize with global memory access from rseq critical sections, see linux commit 2a36ab717e8fe678d98f81c14a0b124712719840 rseq/membarrier: Add MEMBARRIER_CMD_PRIVATE_EXPEDITED_RSEQ
2020-12-19 20:27:22 +00:00
#define MEMBARRIER_CMD_PRIVATE_EXPEDITED_RSEQ 128
#define MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED_RSEQ 256
add membarrier syscall wrapper, refactor dynamic tls install to use it the motivation for this change is twofold. first, it gets the fallback logic out of the dynamic linker, improving code readability and organization. second, it provides application code that wants to use the membarrier syscall, which depends on preregistration of intent before the process becomes multithreaded unless unbounded latency is acceptable, with a symbol that, when linked, ensures that this registration happens.
2019-02-22 07:56:10 +00:00
#define MEMBARRIER_CMD_SHARED MEMBARRIER_CMD_GLOBAL
sys/membarrier.h: add new constants from linux v5.10 can cause rseq restart on another cpu to synchronize with global memory access from rseq critical sections, see linux commit 2a36ab717e8fe678d98f81c14a0b124712719840 rseq/membarrier: Add MEMBARRIER_CMD_PRIVATE_EXPEDITED_RSEQ
2020-12-19 20:27:22 +00:00
#define MEMBARRIER_CMD_FLAG_CPU 1
add membarrier syscall wrapper, refactor dynamic tls install to use it the motivation for this change is twofold. first, it gets the fallback logic out of the dynamic linker, improving code readability and organization. second, it provides application code that wants to use the membarrier syscall, which depends on preregistration of intent before the process becomes multithreaded unless unbounded latency is acceptable, with a symbol that, when linked, ensures that this registration happens.
2019-02-22 07:56:10 +00:00
int membarrier(int, int);
#endif