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- use "volatile" to prevent from optimization for writes to page

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This commit is contained in:
gbeauche 2001-06-05 12:16:34 +00:00
parent ea1f0a0761
commit fe6ad83317
1 changed files with 4 additions and 4 deletions
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8
BasiliskII/src/Unix/sigsegv.cpp
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@ -250,16 +250,16 @@ void sigsegv_deinstall_handler(void)
#include <fcntl.h> #include <fcntl.h>
#include <sys/mman.h> #include <sys/mman.h>
static caddr_t page = 0;
static int page_size; static int page_size;
static int handler_called = 0; static volatile char * page = 0;
static volatile int handler_called = 0;
static bool sigsegv_test_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address) static bool sigsegv_test_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
{ {
handler_called++; handler_called++;
if ((fault_address - 123) != page) if ((fault_address - 123) != page)
exit(1); exit(1);
if (mprotect((caddr_t)((unsigned long)fault_address & -page_size), page_size, PROT_READ | PROT_WRITE) != 0) if (mprotect((char *)((unsigned long)fault_address & -page_size), page_size, PROT_READ | PROT_WRITE) != 0)
exit(1); exit(1);
return true; return true;
} }
@ -271,7 +271,7 @@ int main(void)
return 1; return 1;
page_size = getpagesize(); page_size = getpagesize();
page = (caddr_t)mmap(0, page_size, PROT_READ, MAP_PRIVATE, zero_fd, 0); page = (char *)mmap(0, page_size, PROT_READ, MAP_PRIVATE, zero_fd, 0);
if (page == MAP_FAILED) if (page == MAP_FAILED)
return 1; return 1;