- 20 3月, 2011 3 次提交
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由 Rich Felker 提交于
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由 Rich Felker 提交于
with this patch, the syscallN() functions are no longer needed; a variadic syscall() macro allows syscalls with anywhere from 0 to 6 arguments to be made with a single macro name. also, manually casting each non-integer argument with (long) is no longer necessary; the casts are hidden in the macros. some source files which depended on being able to define the old macro SYSCALL_RETURNS_ERRNO have been modified to directly use __syscall() instead of syscall(). references to SYSCALL_SIGSET_SIZE and SYSCALL_LL have also been changed. x86_64 has not been tested, and may need a follow-up commit to fix any minor bugs/oversights.
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由 Rich Felker 提交于
this commit shuffles around the location of syscall definitions so that we can make a syscall() library function with both SYS_* and __NR_* style syscall names available to user applications, provides the syscall() library function, and optimizes the code that performs the actual inline syscalls in the library itself. previously on i386 when built as PIC (shared library), syscalls were incurring bus lock (lock prefix) overhead at entry and exit, due to the way the ebx register was being loaded (xchg instruction with a memory operand). now the xchg takes place between two registers. further cleanup to arch/$(ARCH)/syscall.h is planned.
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- 16 3月, 2011 1 次提交
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由 Rich Felker 提交于
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- 13 3月, 2011 1 次提交
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由 Rich Felker 提交于
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- 11 3月, 2011 2 次提交
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由 Rich Felker 提交于
we can avoid blocking signals by simply using a flag to mark that the thread has exited and prevent it from getting counted in the rsyscall signal-pingpong. this restores the original pthread create/join throughput from before the sigprocmask call was added.
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由 Rich Felker 提交于
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- 20 2月, 2011 2 次提交
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由 Rich Felker 提交于
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由 Rich Felker 提交于
the existence of a (kernelspace) thread must never have observable effects after the thread count is decremented. if signals are not blocked, it could end up handling the signal for rsyscall and contributing towards the count of threads which have changed ids, causing a thread to be missed. this could lead to one thread retaining unwanted privilege level. this change may also address other subtle race conditions in application code that uses signals.
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- 19 2月, 2011 1 次提交
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由 Rich Felker 提交于
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- 18 2月, 2011 1 次提交
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由 Rich Felker 提交于
this allows sys/types.h to provide the pthread types, as required by POSIX. this design also facilitates forcing ABI-compatible sizes in the arch-specific alltypes.h, while eliminating the need for developers changing the internals of the pthread types to poke around with arch-specific headers they may not be able to test.
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- 15 2月, 2011 2 次提交
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由 Rich Felker 提交于
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由 Rich Felker 提交于
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- 14 2月, 2011 1 次提交
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由 Rich Felker 提交于
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- 12 2月, 2011 1 次提交
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由 Rich Felker 提交于
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