thread_patch.c

//Workaround for Unity game slowing in iPhone4 + 7.1
//Write in main.mm

#include <pthread.h>
#include <dlfcn.h>

typedef int (*pthread_create_f)(pthread_t * __restrict, const pthread_attr_t * __restrict, void *(*)(void *), void * __restrict);
static pthread_create_f real_create = NULL;

extern "C" int pthread_create(pthread_t * __restrict thread, const pthread_attr_t * __restrict attr, void *(*start)(void *), void * __restrict arg)
{
    int rc;
    if (!real_create)
        real_create = (pthread_create_f)dlsym(RTLD_NEXT, "pthread_create");
    
    rc = (*real_create)(thread, attr, start, arg);
    
    struct sched_param param;
    int policy;
    pthread_getschedparam(*thread, &policy, &param);
    pthread_setschedparam(*thread, SCHED_FIFO, &param);
    
    return rc;
}