Problem - Kevin Tafuro

typedef struct _spc_threadpool_task {
spc_threadpool_fnptr fnptr;
void *arg;
struct _spc_threadpool_task *next;
} spc_threadpool_task;
typedef struct {
int size;
int destroy;
#ifndef WIN32
pthread_t *tids;
pthread_cond_t cond;
#else
HANDLE *tids;
HANDLE cond;
#endif
spc_threadpool_task *tasks;
spc_threadpool_task *tail;
} spc_threadpool_t;
#ifndef WIN32
#define SPC_ACQUIRE_MUTEX(mtx) pthread_mutex_lock(&(mtx))
#define SPC_RELEASE_MUTEX(mtx) pthread_mutex_unlock(&(mtx))
#define SPC_CREATE_COND(cond) pthread_cond_init(&(cond), 0)
#define SPC_DESTROY_COND(cond) pthread_cond_destroy(&(cond))
#define SPC_SIGNAL_COND(cond) pthread_cond_signal(&(cond))
#define SPC_BROADCAST_COND(cond) pthread_cond_broadcast(&(cond))
#define SPC_WAIT_COND(cond, mtx) pthread_cond_wait(&(cond), &(mtx))
#define SPC_CLEANUP_PUSH(func, arg) pthread_cleanup_push(func, arg)
#define SPC_CLEANUP_POP(exec) pthread_cleanup_pop(exec)
#define SPC_CREATE_THREAD(t, f, arg) (!pthread_create(&(t), 0, (f), (arg)))
static pthread_mutex_t threadpool_mutex = PTHREAD_MUTEX_INITIALIZER;
#else
#define SPC_ACQUIRE_MUTEX(mtx) WaitForSingleObjectEx((mtx), INFINITE, FALSE)
#define SPC_RELEASE_MUTEX(mtx) ReleaseMutex((mtx))
#define SPC_CREATE_COND(cond) (cond) = CreateEvent(0, TRUE, FALSE, 0)
#define SPC_DESTROY_COND(cond) CloseHandle((cond))
#define SPC_SIGNAL_COND(cond) SetEvent((cond))
#define SPC_BROADCAST_COND(cond) PulseEvent((cond))
#define SPC_WAIT_COND(cond, mtx) spc_win32_wait_cond((cond), (mtx))
#define SPC_CLEANUP_PUSH(func, arg) { void (*__spc_func)(void *) = (func); \
void *__spc_arg = (arg)
#define SPC_CLEANUP_POP(exec) if ((exec)) __spc_func(__spc_arg); } \
do { } while (0)
#define SPC_CREATE_THREAD(t, f, arg) ((t) = CreateThread(0, 0, (f), (arg), 0, 0))
static HANDLE threadpool_mutex = 0;
#endif
#ifdef WIN32
static void spc_win32_wait_cond(HANDLE cond, HANDLE mutex) {
HANDLE handles[2];
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