| Hello, I've been getting acquainted with the C interface for libpq and have run into an issue with trying to link to the dynamic libpq while still getting thread safety. I have tried the following by compiling the 9.1 source with the --enable-thread-safety flag and I've tried the libpq libraries provided in the EnterpriseDB build of 9.1. All of this is on Mac OS X 10.6.8 with XCode 4.0.2. The problem I'm having is that PQisthreadsafe() returns 0 when I link to the dynamic library(libpq.5.4.dylib), but it returns 1 when I link to the static library (libpq.a). The code I'm using is as follows: #include "libpq-fe.h" int main (int argc, const char * argv[]) { if (PQisthreadsafe() == 1) { puts("Thread safe"); } else { puts("Not thread safe"); } } Commands and output (main.c, libpq.a and libpq.5.4.dylib are all in the same directory): gcc -I /Library/PostgreSQL/9.1/include main.c libpq.a -o main Output: "Thread safe" gcc -I /Library/PostgreSQL/9.1/include main.c libpq.5.4.dylib -o main Output: "Not thread safe" I'm admittedly not great with the nuances of the linker or with the PostgreSQL C interface so it's possible I'm missing something obvious here. If anyone knows how I should be using libpq as a dynamic library with thread safety, then that would be a great help. Regards, __________________________________ David McKeone Arts Management Systems Ltd. Phone: (403) 536-1203 Fax: (403) 536-1210 |
